Add constants for annotation flags.

Remove existing #defines in cpdf_annot.h.

BUG=pdfium:1049

Change-Id: I67ea3330a28937a4836da242fc1936fc98817240
Reviewed-on: https://pdfium-review.googlesource.com/c/49692
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
diff --git a/fpdfsdk/cpdfsdk_interactiveform.cpp b/fpdfsdk/cpdfsdk_interactiveform.cpp
index 1e761cf..f13fc54 100644
--- a/fpdfsdk/cpdfsdk_interactiveform.cpp
+++ b/fpdfsdk/cpdfsdk_interactiveform.cpp
@@ -13,6 +13,7 @@
 #include <utility>
 #include <vector>
 
+#include "constants/annotation_flags.h"
 #include "core/fpdfapi/page/cpdf_page.h"
 #include "core/fpdfapi/parser/cfdf_document.h"
 #include "core/fpdfapi/parser/cpdf_array.h"
@@ -440,12 +441,12 @@
 
       if (CPDFSDK_Widget* pWidget = GetWidget(pControl)) {
         uint32_t nFlags = pWidget->GetFlags();
-        nFlags &= ~ANNOTFLAG_INVISIBLE;
-        nFlags &= ~ANNOTFLAG_NOVIEW;
+        nFlags &= ~pdfium::annotation_flags::kInvisible;
+        nFlags &= ~pdfium::annotation_flags::kNoView;
         if (bHide)
-          nFlags |= ANNOTFLAG_HIDDEN;
+          nFlags |= pdfium::annotation_flags::kHidden;
         else
-          nFlags &= ~ANNOTFLAG_HIDDEN;
+          nFlags &= ~pdfium::annotation_flags::kHidden;
         pWidget->SetFlags(nFlags);
         pWidget->GetPageView()->UpdateView(pWidget);
         bChanged = true;