Name core/fxge/android files appropriately and use one file per class

core/fxge/android/fx_android_font.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_FX_ANDROID_FONT_H_
-#define CORE_FXGE_ANDROID_FX_ANDROID_FONT_H_
-
-#include "core/fxcrt/fx_system.h"
-
-#if _FX_OS_ == _FX_ANDROID_
-
-#include "core/fxge/cfx_fontmapper.h"
-#include "core/fxge/fx_font.h"
-#include "core/fxge/ifx_systemfontinfo.h"
-
-class CFPF_SkiaFontMgr;
-
-class CFX_AndroidFontInfo : public IFX_SystemFontInfo {
- public:
-  CFX_AndroidFontInfo();
-  ~CFX_AndroidFontInfo() override;
-
-  FX_BOOL Init(CFPF_SkiaFontMgr* pFontMgr);
-
-  // IFX_SystemFontInfo:
-  FX_BOOL EnumFontList(CFX_FontMapper* pMapper) override;
-  void* MapFont(int weight,
-                FX_BOOL bItalic,
-                int charset,
-                int pitch_family,
-                const FX_CHAR* face,
-                int& bExact) override;
-  void* GetFont(const FX_CHAR* face) override;
-  uint32_t GetFontData(void* hFont,
-                       uint32_t table,
-                       uint8_t* buffer,
-                       uint32_t size) override;
-  FX_BOOL GetFaceName(void* hFont, CFX_ByteString& name) override;
-  FX_BOOL GetFontCharset(void* hFont, int& charset) override;
-  void DeleteFont(void* hFont) override;
-
- protected:
-  CFPF_SkiaFontMgr* m_pFontMgr;
-};
-
-#endif  // _FX_OS_ == _FX_ANDROID_
-
-#endif  // CORE_FXGE_ANDROID_FX_ANDROID_FONT_H_