base::RefCounted now DCHECKs when referenced from multiple threads.

ui/gfx/image/image.cc

 // Copyright (c) 2012 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.
 
 #include "ui/gfx/image/image.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/logging.h"
@@ skipping 320 matching lines @@
  private:
   NSImage* image_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageRepCocoa);
 };
 #endif  // defined(OS_MACOSX)
 
 // The Storage class acts similarly to the pixels in a SkBitmap: the Image
 // class holds a refptr instance of Storage, which in turn holds all the
 // ImageReps. This way, the Image can be cheaply copied.
-class ImageStorage : public base::RefCounted<ImageStorage> {
+// TODO(mgiuca): Avoid using UnsafeRefCounted. http://crbug.com/469952.
+class ImageStorage : public base::UnsafeRefCounted<ImageStorage> {
  public:
   ImageStorage(Image::RepresentationType default_type)
       : default_representation_type_(default_type),
 #if defined(OS_MACOSX) && !defined(OS_IOS)
         default_representation_color_space_(
             base::mac::GetGenericRGBColorSpace()),
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
         representations_deleter_(&representations_) {
   }
 
   Image::RepresentationType default_representation_type() {
     return default_representation_type_;
   }
   Image::RepresentationMap& representations() { return representations_; }
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   void set_default_representation_color_space(CGColorSpaceRef color_space) {
     default_representation_color_space_ = color_space;
   }
   CGColorSpaceRef default_representation_color_space() {
     return default_representation_color_space_;
   }
 #endif  // defined(OS_MACOSX) && !defined(OS_IOS)
 
  private:
-  friend class base::RefCounted<ImageStorage>;
+  friend class base::UnsafeRefCounted<ImageStorage>;
 
   ~ImageStorage() {}
 
   // The type of image that was passed to the constructor. This key will always
   // exist in the |representations_| map.
   Image::RepresentationType default_representation_type_;
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   // The default representation's colorspace. This is used for converting to
   // NSImage. This field exists to compensate for PNGCodec not writing or
@@ skipping 369 matching lines @@
   }
   return it->second;
 }
 
 void Image::AddRepresentation(internal::ImageRep* rep) const {
   CHECK(storage_.get());
   storage_->representations().insert(std::make_pair(rep->type(), rep));
 }
 
 }  // namespace gfx