gfx: Make conversions from Size to SizeF be explicit.

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 41 matching lines @@
   }
 
  private:
   float scale_;
 };
 
 ImageSkiaRep ScaleImageSkiaRep(const ImageSkiaRep& rep, float target_scale) {
   if (rep.is_null() || rep.scale() == target_scale)
     return rep;
 
-  gfx::Size scaled_size = ToCeiledSize(
-      gfx::ScaleSize(rep.pixel_size(), target_scale / rep.scale()));
+  gfx::Size scaled_size =
+      gfx::ScaleToCeiledSize(rep.pixel_size(), target_scale / rep.scale());
   return ImageSkiaRep(skia::ImageOperations::Resize(
       rep.sk_bitmap(),
       skia::ImageOperations::RESIZE_LANCZOS3,
       scaled_size.width(),
       scaled_size.height()), target_scale);
 }
 
 }  // namespace
 
 // A helper class such that ImageSkia can be cheaply copied. ImageSkia holds a
@@ skipping 418 matching lines @@
 bool ImageSkia::CanModify() const {
   return !storage_.get() || storage_->CanModify();
 }
 
 void ImageSkia::DetachStorageFromThread() {
   if (storage_.get())
     storage_->DetachFromThread();
 }
 
 }  // namespace gfx