Remove more unneeded includes and code from headers.

Change-Id: I0a07dbc9850bef2184ed35ff04b08385fc1bdd17
Reviewed-on: https://pdfium-review.googlesource.com/22891
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>

core/fpdfapi/page/cpdf_image.cpp

diff --git a/core/fpdfapi/page/cpdf_image.cpp b/core/fpdfapi/page/cpdf_image.cpp
index 5221fd7..65ca78e 100644
--- a/core/fpdfapi/page/cpdf_image.cpp
+++ b/core/fpdfapi/page/cpdf_image.cpp
@@ -26,6 +26,7 @@
 #include "core/fpdfapi/render/cpdf_pagerendercache.h"
 #include "core/fxcodec/codec/ccodec_jpegmodule.h"
 #include "core/fxcrt/fx_stream.h"
+#include "core/fxge/dib/cfx_dibitmap.h"
 #include "core/fxge/fx_dib.h"
 #include "third_party/base/numerics/safe_conversions.h"
 #include "third_party/base/ptr_util.h"