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_annotiterator.cpp b/fpdfsdk/cpdfsdk_annotiterator.cpp
index 01a4e15..0505ce0 100644
--- a/fpdfsdk/cpdfsdk_annotiterator.cpp
+++ b/fpdfsdk/cpdfsdk_annotiterator.cpp
@@ -9,7 +9,7 @@
 #include <algorithm>
 
 #include "fpdfsdk/include/cpdfsdk_annot.h"
-#include "fpdfsdk/include/fsdk_mgr.h"
+#include "fpdfsdk/include/cpdfsdk_pageview.h"
 
 CPDFSDK_AnnotIterator::CPDFSDK_AnnotIterator(CPDFSDK_PageView* pPageView,
                                              bool bReverse)