Remove SharedBuffer::unlock() and keep Resource's SharedBuffer always locked

third_party/WebKit/Source/core/fetch/FontResource.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile, Inc.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 122 matching lines @@
     }
     return m_fontData.get();
 }
 
 FontPlatformData FontResource::platformDataFromCustomData(float size, bool bold, bool italic, FontOrientation orientation)
 {
     ASSERT(m_fontData);
     return m_fontData->fontPlatformData(size, bold, italic, orientation);
 }
 
-bool FontResource::isSafeToUnlock() const
-{
-    return data()->hasOneRef();
-}
-
 void FontResource::fontLoadShortLimitCallback(TimerBase*)
 {
     if (!isLoading())
         return;
     ASSERT(m_loadLimitState == UnderLimit);
     m_loadLimitState = ShortLimitExceeded;
     ResourceClientWalker<FontResourceClient> walker(clients());
     while (FontResourceClient* client = walker.next())
         client->fontLoadShortLimitExceeded(this);
 }
@@ skipping 17 matching lines @@
 
 void FontResource::checkNotify()
 {
     m_fontLoadShortLimitTimer.stop();
     m_fontLoadLongLimitTimer.stop();
 
     Resource::checkNotify();
 }
 
 } // namespace blink