gfx: Make conversions from Size to SizeF be explicit.

ui/views/widget/desktop_aura/desktop_screen_x11.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/views/widget/desktop_aura/desktop_screen_x11.h"
 
 #include <X11/extensions/Xrandr.h>
 #include <X11/Xlib.h>
 
 // It clashes with out RootWindow.
@@ skipping 307 matching lines @@
 
       if (has_work_area) {
         gfx::Rect intersection_in_pixels = crtc_bounds;
         intersection_in_pixels.Intersect(work_area_in_pixels);
         // SetScaleAndBounds() above does the conversion from pixels to DIP for
         // us, but set_work_area does not, so we need to do it here.
         display.set_work_area(gfx::Rect(
             gfx::ToFlooredPoint(
                 gfx::ScalePoint(intersection_in_pixels.origin(),
                                 1.0f / display.device_scale_factor())),
-            gfx::ToFlooredSize(
-                gfx::ScaleSize(intersection_in_pixels.size(),
-                               1.0f / display.device_scale_factor()))));
+            gfx::ScaleToFlooredSize(intersection_in_pixels.size(),
+                                    1.0f / display.device_scale_factor())));
       }
 
       switch (crtc->rotation) {
         case RR_Rotate_0:
           display.set_rotation(gfx::Display::ROTATE_0);
           break;
         case RR_Rotate_90:
           display.set_rotation(gfx::Display::ROTATE_90);
           break;
         case RR_Rotate_180:
@@ skipping 21 matching lines @@
   change_notifier_.NotifyDisplaysChanged(old_displays, displays_);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 gfx::Screen* CreateDesktopScreen() {
   return new DesktopScreenX11;
 }
 
 }  // namespace views