image-skia: Remove implicit conversion to SkBitmap on linux and chromeos.

ui/gfx/image/image_skia.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_skia.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 
@@ skipping 258 matching lines @@
   ImageSkiaReps image_reps;
   for (ImageSkiaReps::iterator it = internal_image_reps.begin();
        it != internal_image_reps.end(); ++it) {
     if (!it->is_null())
       image_reps.push_back(*it);
   }
 
   return image_reps;
 }
 
-ImageSkia::operator SkBitmap&() const {
+void ImageSkia::Init(const ImageSkiaRep& image_rep) {
+  // TODO(pkotwicz): The image should be null whenever image rep is null.
+  if (image_rep.sk_bitmap().empty()) {
+    storage_ = NULL;
+    return;
+  }
+  storage_ = new internal::ImageSkiaStorage(
+      NULL, gfx::Size(image_rep.GetWidth(), image_rep.GetHeight()));
+  storage_->image_reps().push_back(image_rep);
+}
+
+SkBitmap& ImageSkia::GetBitmap() const {
   if (isNull()) {
     // Callers expect a ImageSkiaRep even if it is |isNull()|.
     // TODO(pkotwicz): Fix this.
     return NullImageRep().mutable_sk_bitmap();
   }
 
   ImageSkiaReps::iterator it =
       storage_->FindRepresentation(ui::SCALE_FACTOR_100P, true);
   if (it != storage_->image_reps().end())
     return it->mutable_sk_bitmap();
   return NullImageRep().mutable_sk_bitmap();
 }
 
-void ImageSkia::Init(const ImageSkiaRep& image_rep) {
-  // TODO(pkotwicz): The image should be null whenever image rep is null.
-  if (image_rep.sk_bitmap().empty()) {
-    storage_ = NULL;
-    return;
-  }
-  storage_ = new internal::ImageSkiaStorage(
-      NULL, gfx::Size(image_rep.GetWidth(), image_rep.GetHeight()));
-  storage_->image_reps().push_back(image_rep);
-}
-
 }  // namespace gfx