gfx: Make conversions from Size to SizeF be explicit.

ui/aura/test/test_screen.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/aura/test/test_screen.h"
 
 #include "base/logging.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
@@ skipping 98 matching lines @@
 
 gfx::Transform TestScreen::GetUIScaleTransform() const {
   gfx::Transform ui_scale;
   ui_scale.Scale(1.0f / ui_scale_, 1.0f / ui_scale_);
   return ui_scale;
 }
 
 void TestScreen::OnWindowBoundsChanged(
     Window* window, const gfx::Rect& old_bounds, const gfx::Rect& new_bounds) {
   DCHECK_EQ(host_->window(), window);
-  display_.SetSize(gfx::ToFlooredSize(
-      gfx::ScaleSize(new_bounds.size(), display_.device_scale_factor())));
+  display_.SetSize(gfx::ScaleToFlooredSize(new_bounds.size(),
+                                           display_.device_scale_factor()));
 }
 
 void TestScreen::OnWindowDestroying(Window* window) {
   if (host_->window() == window)
     host_ = NULL;
 }
 
 gfx::Point TestScreen::GetCursorScreenPoint() {
   return Env::GetInstance()->last_mouse_location();
 }
@@ skipping 39 matching lines @@
 
 TestScreen::TestScreen(const gfx::Rect& screen_bounds)
     : host_(NULL),
       ui_scale_(1.0f) {
   static int64 synthesized_display_id = 2000;
   display_.set_id(synthesized_display_id++);
   display_.SetScaleAndBounds(1.0f, screen_bounds);
 }
 
 }  // namespace aura