Make the FloatSize constructor from an IntSize explicit.

third_party/WebKit/Source/web/FullscreenController.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 170 matching lines @@
     LayoutFullScreen* layoutObject = Fullscreen::from(*m_fullScreenFrame->document()).fullScreenLayoutObject();
     if (layoutObject)
         layoutObject->updateStyle();
 }
 
 void FullscreenController::updatePageScaleConstraints(bool removeConstraints)
 {
     PageScaleConstraints fullscreenConstraints;
     if (!removeConstraints) {
         fullscreenConstraints = PageScaleConstraints(1.0, 1.0, 1.0);
-        fullscreenConstraints.layoutSize = IntSize(m_webViewImpl->size());
+        fullscreenConstraints.layoutSize = FloatSize(m_webViewImpl->size());
     }
     m_webViewImpl->pageScaleConstraintsSet().setFullscreenConstraints(fullscreenConstraints);
     m_webViewImpl->pageScaleConstraintsSet().computeFinalConstraints();
     m_webViewImpl->updateMainFrameLayoutSize();
 }
 
 DEFINE_TRACE(FullscreenController)
 {
     visitor->trace(m_provisionalFullScreenElement);
     visitor->trace(m_fullScreenFrame);
 }
 
 } // namespace blink