Revert of DirectWrite Font Cache browser side hookup

content/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_COMMON_DWRITE_FONT_PLATFORM_WIN_H_
+#define CONTENT_COMMON_DWRITE_FONT_PLATFORM_WIN_H_
+
+#include "base/files/file.h"
+#include "content/common/content_export.h"
+
+struct IDWriteFactory;
+struct IDWriteFontCollection;
+
+namespace content {
+
+// 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);
+
+// Build and load is to accomplish both tasks of creating a font cache within
+// specified file and then loading it, where loading means creating
+// readonly shared memory mapping. As this function need to iterate through all
+// available fonts in the system, it may take a while.
+CONTENT_EXPORT bool BuildAndLoadFontCache(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_COMMON_DWRITE_FONT_PLATFORM_WIN_H_