Clean up fx_ge.h and IWYU.

fpdfsdk/include/fsdk_define.h

Index: fpdfsdk/include/fsdk_define.h
diff --git a/fpdfsdk/include/fsdk_define.h b/fpdfsdk/include/fsdk_define.h
index 536e35886f549e611083cc720a900b191595a01b..a8a02d665e11975adf6829eeaacad31fd97498d2 100644
--- a/fpdfsdk/include/fsdk_define.h
+++ b/fpdfsdk/include/fsdk_define.h
@@ -9,8 +9,6 @@
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_parser.h"
 #include "core/fpdfdoc/include/fpdf_doc.h"
-#include "core/fxge/include/fx_ge.h"
-#include "core/fxge/include/fx_ge_win32.h"
 #include "public/fpdfview.h"
 
 #ifdef PDF_ENABLE_XFA
@@ -63,22 +61,23 @@ class CPDF_CustomAccess final : public IFX_FileRead {
 #ifdef PDF_ENABLE_XFA
 class CFPDF_FileStream : public IFX_FileStream {
  public:
-  CFPDF_FileStream(FPDF_FILEHANDLER* pFS);
-  virtual ~CFPDF_FileStream() {}
-
-  virtual IFX_FileStream* Retain();
-  virtual void Release();
-
-  virtual FX_FILESIZE GetSize();
-  virtual FX_BOOL IsEOF();
-  virtual FX_FILESIZE GetPosition() { return m_nCurPos; }
-  virtual void SetPosition(FX_FILESIZE pos) { m_nCurPos = pos; }
-  virtual FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size);
-  virtual size_t ReadBlock(void* buffer, size_t size);
-  virtual FX_BOOL WriteBlock(const void* buffer,
-                             FX_FILESIZE offset,
-                             size_t size);
-  virtual FX_BOOL Flush();
+  explicit CFPDF_FileStream(FPDF_FILEHANDLER* pFS);
+  ~CFPDF_FileStream() override {}
+
+  // IFX_FileStream:
+  IFX_FileStream* Retain() override;
+  void Release() override;
+  FX_FILESIZE GetSize() override;
+  FX_BOOL IsEOF() override;
+  FX_FILESIZE GetPosition() override { return m_nCurPos; }
+  FX_BOOL ReadBlock(void* buffer, FX_FILESIZE offset, size_t size) override;
+  size_t ReadBlock(void* buffer, size_t size) override;
+  FX_BOOL WriteBlock(const void* buffer,
+                     FX_FILESIZE offset,
+                     size_t size) override;
+  FX_BOOL Flush() override;
+
+  void SetPosition(FX_FILESIZE pos) { m_nCurPos = pos; }
 
  protected:
   FPDF_FILEHANDLER* m_pFS;