content: Cleanup class/struct forward declarations

content/child/font_warmup_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_CHILD_FONT_WARMUP_WIN_H_
 #define CONTENT_CHILD_FONT_WARMUP_WIN_H_
 
 #include <stddef.h>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "content/common/content_export.h"
 
 class SkFontMgr;
-class SkTypeface;
 
 namespace content {
 
 class GdiFontPatchData {
  public:
   virtual ~GdiFontPatchData() {}
 
  protected:
   GdiFontPatchData() {}
 
@@ skipping 30 matching lines @@
 // OpenSCManagerW
 // OpenServiceW
 // StartServiceW
 // CloseServiceHandle.
 // These are all IAT patched.
 CONTENT_EXPORT void PatchServiceManagerCalls();
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_FONT_WARMUP_WIN_H_