Split fsdk_mgr files apart.

This CL separates the CPDFDoc_Environment, CPDFSDK_Document and CPDFSDK_PageView
classes into their own h and cpp files.

Review-Url: https://codereview.chromium.org/2335243002
diff --git a/fpdfsdk/cpdfsdk_annothandlermgr.cpp b/fpdfsdk/cpdfsdk_annothandlermgr.cpp
index 0fd48d2..8fa1093 100644
--- a/fpdfsdk/cpdfsdk_annothandlermgr.cpp
+++ b/fpdfsdk/cpdfsdk_annothandlermgr.cpp
@@ -8,12 +8,14 @@
 
 #include "core/fpdfdoc/include/cpdf_annot.h"
 #include "fpdfsdk/include/cba_annotiterator.h"
+#include "fpdfsdk/include/cpdfdoc_environment.h"
 #include "fpdfsdk/include/cpdfsdk_annot.h"
 #include "fpdfsdk/include/cpdfsdk_baannot.h"
 #include "fpdfsdk/include/cpdfsdk_baannothandler.h"
 #include "fpdfsdk/include/cpdfsdk_datetime.h"
+#include "fpdfsdk/include/cpdfsdk_document.h"
+#include "fpdfsdk/include/cpdfsdk_pageview.h"
 #include "fpdfsdk/include/cpdfsdk_widgethandler.h"
-#include "fpdfsdk/include/fsdk_mgr.h"
 
 #ifdef PDF_ENABLE_XFA
 #include "fpdfsdk/include/cpdfsdk_xfawidgethandler.h"