gfx: Make conversions from Size to SizeF be explicit.

chrome/browser/android/thumbnail/thumbnail_cache.cc

 // Copyright 2014 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 "chrome/browser/android/thumbnail/thumbnail_cache.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/android/path_utils.h"
@@ skipping 896 matching lines @@
 }
 
 std::pair<SkBitmap, float> ThumbnailCache::CreateApproximation(
     const SkBitmap& bitmap,
     float scale) {
   DCHECK(!bitmap.empty());
   DCHECK_GT(scale, 0);
   SkAutoLockPixels bitmap_lock(bitmap);
   float new_scale = 1.f / kApproximationScaleFactor;
 
-  gfx::Size dst_size = gfx::ToFlooredSize(
-      gfx::ScaleSize(gfx::Size(bitmap.width(), bitmap.height()), new_scale));
+  gfx::Size dst_size = gfx::ScaleToFlooredSize(
+      gfx::Size(bitmap.width(), bitmap.height()), new_scale);
   SkBitmap dst_bitmap;
   dst_bitmap.allocPixels(SkImageInfo::Make(dst_size.width(),
                                            dst_size.height(),
                                            bitmap.info().colorType(),
                                            bitmap.info().alphaType()));
   dst_bitmap.eraseColor(0);
   SkAutoLockPixels dst_bitmap_lock(dst_bitmap);
 
   SkCanvas canvas(dst_bitmap);
   canvas.scale(new_scale, new_scale);
   canvas.drawBitmap(bitmap, 0, 0, NULL);
   dst_bitmap.setImmutable();
 
   return std::make_pair(dst_bitmap, new_scale * scale);
 }