Implement WTF::WeakPtr in terms of base::WeakPtr

third_party/WebKit/Source/platform/fonts/FontFallbackList.cpp

 /*
  * Copyright (C) 2006 Apple Computer, Inc.  All rights reserved.
  *
  * 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 56 matching lines @@
 
 void FontFallbackList::releaseFontData()
 {
     unsigned numFonts = m_fontList.size();
     for (unsigned i = 0; i < numFonts; ++i) {
         if (!m_fontList[i]->isCustomFont()) {
             ASSERT(!m_fontList[i]->isSegmented());
             FontCache::fontCache()->releaseFontData(toSimpleFontData(m_fontList[i]));
         }
     }
-    m_shapeCache.clear(); // Clear the weak pointer to the cache instance.
+    m_shapeCache.reset(); // Clear the weak pointer to the cache instance.
 }
 
 bool FontFallbackList::loadingCustomFonts() const
 {
     if (!m_hasLoadingFallback)
         return false;
 
     unsigned numFonts = m_fontList.size();
     for (unsigned i = 0; i < numFonts; ++i) {
         if (m_fontList[i]->isLoading())
@@ skipping 146 matching lines @@
 
 bool FontFallbackList::isValid() const
 {
     if (!m_fontSelector)
         return m_fontSelectorVersion == 0;
 
     return m_fontSelector->version() == m_fontSelectorVersion;
 }
 
 } // namespace blink