[Android] Add support for standalone PDFium gn build on Android.

core/fxge/android/fpf_skiamodule.h

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #ifndef CORE_FXGE_ANDROID_FPF_SKIAMODULE_H_
 #define CORE_FXGE_ANDROID_FPF_SKIAMODULE_H_
 
-#include "core/fxcrt/include/fx_system.h'"
+#include "core/fxcrt/include/fx_system.h"
 
 #if _FX_OS_ == _FX_ANDROID_
 
 #include "core/fxge/android/fpf_skiafontmgr.h"
 
 class CFPF_SkiaFontMgr;
 
 class CFPF_SkiaDeviceModule {
  public:
   CFPF_SkiaDeviceModule() : m_pFontMgr(nullptr) {}
   ~CFPF_SkiaDeviceModule();
 
   void Destroy();
   CFPF_SkiaFontMgr* GetFontMgr();
 
  protected:
   CFPF_SkiaFontMgr* m_pFontMgr;
 };
 
 CFPF_SkiaDeviceModule* CFPF_GetSkiaDeviceModule();
 
 #endif  // _FX_OS_ == _FX_ANDROID_
 
 #endif  // CORE_FXGE_ANDROID_FPF_SKIAMODULE_H_