Changes behavior of iOS-specific gfx::Image constructor.

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 <utility>
 
@@ skipping 402 matching lines @@
 
 Image::Image(const ImageSkia& image) {
   if (!image.isNull()) {
     storage_ = new internal::ImageStorage(Image::kImageRepSkia);
     AddRepresentation(
         base::MakeUnique<internal::ImageRepSkia>(new ImageSkia(image)));
   }
 }
 
 #if defined(OS_IOS)
-Image::Image(UIImage* image) : Image(image, base::scoped_policy::ASSUME) {}
+Image::Image(UIImage* image) : Image(image, base::scoped_policy::RETAIN) {}
 
 Image::Image(UIImage* image, base::scoped_policy::OwnershipPolicy policy)
     : storage_(new internal::ImageStorage(Image::kImageRepCocoaTouch)) {
   if (image) {
     if (policy == base::scoped_policy::RETAIN)
       base::mac::NSObjectRetain(image);
     AddRepresentation(base::MakeUnique<internal::ImageRepCocoaTouch>(image));
   }
 }
 #elif defined(OS_MACOSX)
@@ skipping 327 matching lines @@
       storage_->representations().insert(std::make_pair(type, std::move(rep)));
 
   // insert should not fail (implies that there was already a representation of
   // that type in the map).
   CHECK(result.second) << "type was already in map.";
 
   return result.first->second.get();
 }
 
 }  // namespace gfx