Tidy PDF_ENABLE_XFA #ifdefs in fpdfsdk.

-- label matching #endifs
-- prefer #ifdef over #ifndef
-- consolidate some blocks.

R=ochang@chromium.org

Review URL: https://codereview.chromium.org/1484843002 .
diff --git a/fpdfsdk/include/fsdk_mgr.h b/fpdfsdk/include/fsdk_mgr.h
index 4b217f1..385cfdb 100644
--- a/fpdfsdk/include/fsdk_mgr.h
+++ b/fpdfsdk/include/fsdk_mgr.h
@@ -10,10 +10,6 @@
 #include <map>
 
 #include "core/include/fpdftext/fpdf_text.h"
-#ifdef PDF_ENABLE_XFA
-#include "fpdfxfa/fpdfxfa_doc.h"
-#include "fpdfxfa/fpdfxfa_page.h"
-#endif
 #include "fsdk_actionhandler.h"
 #include "fsdk_annothandler.h"
 #include "fsdk_baseannot.h"
@@ -26,6 +22,11 @@
 #include "public/fpdf_fwlevent.h"  // cross platform keycode and events define.
 #include "third_party/base/nonstd_unique_ptr.h"
 
+#ifdef PDF_ENABLE_XFA
+#include "fpdfxfa/fpdfxfa_doc.h"
+#include "fpdfxfa/fpdfxfa_page.h"
+#endif  // PDF_ENABLE_XFA
+
 class CFFL_IFormFiller;
 class CPDFSDK_ActionHandler;
 class CPDFSDK_Annot;
@@ -46,8 +47,8 @@
       m_pInfo->Release(m_pInfo);
     delete this;
   }
+#endif  // PDF_ENABLE_XFA
 
-#endif
   void FFI_Invalidate(FPDF_PAGE page,
                       double left,
                       double top,
@@ -450,8 +451,8 @@
     }
     return L"";
   }
+#endif  // PDF_ENABLE_XFA
 
-#endif
   FX_BOOL IsJSInitiated() const { return m_pInfo && m_pInfo->m_pJsPlatform; }
   void SetSDKDocument(CPDFSDK_Document* pFXDoc) { m_pSDKDoc = pFXDoc; }
   CPDFSDK_Document* GetSDKDocument() const { return m_pSDKDoc; }
@@ -488,29 +489,30 @@
   // Gets the document object for the next layer down; for master this is
   // a CPDF_Document, but for XFA it is a CPDFXFA_Document.
   UnderlyingDocumentType* GetUnderlyingDocument() const {
-#ifndef PDF_ENABLE_XFA
-    return GetPDFDocument();
-#else
+#ifdef PDF_ENABLE_XFA
     return GetXFADocument();
-#endif
+#else   // PDF_ENABLE_XFA
+    return GetPDFDocument();
+#endif  // PDF_ENABLE_XFA
   }
 
   // Gets the CPDF_Document, either directly in master, or from the
   // CPDFXFA_Document for XFA.
-#ifndef PDF_ENABLE_XFA
-  CPDF_Document* GetPDFDocument() const { return m_pDoc; }
-#else
   CPDF_Document* GetPDFDocument() const {
+#ifdef PDF_ENABLE_XFA
     return m_pDoc ? m_pDoc->GetPDFDoc() : nullptr;
+#else   // PDF_ENABLE_XFA
+    return m_pDoc;
+#endif  // PDF_ENABLE_XFA
   }
 
+#ifdef PDF_ENABLE_XFA
   // Gets the XFA document directly (XFA-only).
   CPDFXFA_Document* GetXFADocument() const { return m_pDoc; }
-#endif
 
-#ifdef PDF_ENABLE_XFA
   int GetPageViewCount() const { return m_pageMap.size(); }
-#endif
+#endif  // PDF_ENABLE_XFA
+
   CPDFSDK_PageView* GetPageView(UnderlyingPageType* pPage,
                                 FX_BOOL ReNew = TRUE);
   CPDFSDK_PageView* GetPageView(int nIndex);
@@ -562,14 +564,18 @@
  public:
   CPDFSDK_PageView(CPDFSDK_Document* pSDKDoc, UnderlyingPageType* page);
   ~CPDFSDK_PageView();
+
+#ifdef PDF_ENABLE_XFA
   void PageView_OnDraw(CFX_RenderDevice* pDevice,
                        CPDF_Matrix* pUser2Device,
-#ifndef PDF_ENABLE_XFA
-                       CPDF_RenderOptions* pOptions);
-#else
                        CPDF_RenderOptions* pOptions,
                        const FX_RECT& pClip);
-#endif
+#else   // PDF_ENABLE_XFA
+  void PageView_OnDraw(CFX_RenderDevice* pDevice,
+                       CPDF_Matrix* pUser2Device,
+                       CPDF_RenderOptions* pOptions);
+#endif  // PDF_ENABLE_XFA
+
   const CPDF_Annot* GetPDFAnnotAtPoint(FX_FLOAT pageX, FX_FLOAT pageY);
   CPDFSDK_Annot* GetFXAnnotAtPoint(FX_FLOAT pageX, FX_FLOAT pageY);
   const CPDF_Annot* GetPDFWidgetAtPoint(FX_FLOAT pageX, FX_FLOAT pageY);
@@ -587,20 +593,21 @@
   CPDFSDK_Annot* AddAnnot(CPDF_Dictionary* pDict);
   CPDFSDK_Annot* AddAnnot(const FX_CHAR* lpSubType, CPDF_Dictionary* pDict);
   CPDFSDK_Annot* AddAnnot(CPDF_Annot* pPDFAnnot);
-#ifdef PDF_ENABLE_XFA
-  CPDFSDK_Annot* AddAnnot(IXFA_Widget* pPDFAnnot);
-#endif
+
   FX_BOOL DeleteAnnot(CPDFSDK_Annot* pAnnot);
   size_t CountAnnots() const;
   CPDFSDK_Annot* GetAnnot(size_t nIndex);
   CPDFSDK_Annot* GetAnnotByDict(CPDF_Dictionary* pDict);
-#ifndef PDF_ENABLE_XFA
-  CPDF_Page* GetPDFPage() { return m_page; }
-#else
+
+#ifdef PDF_ENABLE_XFA
+  CPDFSDK_Annot* AddAnnot(IXFA_Widget* pPDFAnnot);
   CPDFSDK_Annot* GetAnnotByXFAWidget(IXFA_Widget* hWidget);
   CPDFXFA_Page* GetPDFXFAPage() { return m_page; }
   CPDF_Page* GetPDFPage();
-#endif
+#else
+  CPDF_Page* GetPDFPage() { return m_page; }
+#endif  // PDF_ENABLE_XFA
+
   CPDF_Document* GetPDFDocument();
   CPDFSDK_Document* GetSDKDocument() { return m_pSDKDoc; }
   FX_BOOL OnLButtonDown(const CPDF_Point& point, FX_UINT nFlag);
@@ -608,7 +615,7 @@
 #ifdef PDF_ENABLE_XFA
   FX_BOOL OnRButtonDown(const CPDF_Point& point, FX_UINT nFlag);
   FX_BOOL OnRButtonUp(const CPDF_Point& point, FX_UINT nFlag);
-#endif
+#endif  // PDF_ENABLE_XFA
   FX_BOOL OnChar(int nChar, FX_UINT nFlag);
   FX_BOOL OnKeyDown(int nKeyCode, int nFlag);
   FX_BOOL OnKeyUp(int nKeyCode, int nFlag);
@@ -634,7 +641,7 @@
   FX_BOOL IsLocked() { return m_bLocked; }
 #ifndef PDF_ENABLE_XFA
   void TakeOverPage() { m_bTakeOverPage = TRUE; }
-#endif
+#endif  // PDF_ENABLE_XFA
 
  private:
   void PageView_OnHighlightFormFields(CFX_RenderDevice* pDevice,
@@ -645,19 +652,17 @@
   nonstd::unique_ptr<CPDF_AnnotList> m_pAnnotList;
   std::vector<CPDFSDK_Annot*> m_fxAnnotArray;
   CPDFSDK_Document* m_pSDKDoc;
-#ifndef PDF_ENABLE_XFA
-  CPDFSDK_Widget* m_CaptureWidget;
-#else
+#ifdef PDF_ENABLE_XFA
   CPDFSDK_Annot* m_CaptureWidget;
-#endif
+#else  // PDF_ENABLE_XFA
+  CPDFSDK_Widget* m_CaptureWidget;
+  FX_BOOL m_bTakeOverPage;
+#endif  // PDF_ENABLE_XFA
   FX_BOOL m_bEnterWidget;
   FX_BOOL m_bExitWidget;
   FX_BOOL m_bOnWidget;
   FX_BOOL m_bValid;
   FX_BOOL m_bLocked;
-#ifndef PDF_ENABLE_XFA
-  FX_BOOL m_bTakeOverPage;
-#endif
 };
 
 template <class TYPE>