Switch to direct write font proxy and remove the font cache.

content/public/common/dwrite_font_platform_win.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_PUBLIC_COMMON_DWRITE_FONT_PLATFORM_WIN_H_
-#define CONTENT_PUBLIC_COMMON_DWRITE_FONT_PLATFORM_WIN_H_
-
-#include "base/files/file.h"
-#include "content/common/content_export.h"
-
-struct IDWriteFactory;
-struct IDWriteFontCollection;
-
-namespace content {
-
-// This is the shared section that is used between browser and renderer for
-// loading font cache. Section name is suffixed with browser process id so that
-// multiple instance chrome scenario works fine.
-CONTENT_EXPORT extern const char kFontCacheSharedSectionName[];
-
-// Function returns custom font collection in terms of IDWriteFontCollection.
-// This function maintains singleton instance of font collection and returns
-// it on repeated calls.
-CONTENT_EXPORT IDWriteFontCollection* GetCustomFontCollection(
-    IDWriteFactory* factory);
-
-// Builds static font cache. As this function need to iterate through all
-// available fonts in the system, it may take a while.
-CONTENT_EXPORT bool BuildFontCache(const base::FilePath& file);
-
-// Loads font cache from file. This is supposed to be used from browser
-// side where loading means creating readonly shared memory file mapping so that
-// renderers can read from it.
-CONTENT_EXPORT bool LoadFontCache(const base::FilePath& path);
-
-// Added in header mainly for unittest
-CONTENT_EXPORT bool ValidateFontCacheFile(base::File* file);
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_COMMON_DWRITE_FONT_PLATFORM_WIN_H_