Type conversion fixes, ui/gfx/ edition.

ui/gfx/geometry/size.h

 // 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.
 
 #ifndef UI_GFX_GEOMETRY_SIZE_H_
 #define UI_GFX_GEOMETRY_SIZE_H_
 
 #include <iosfwd>
 #include <string>
 
@@ skipping 27 matching lines @@
   Size& operator=(const CGSize& s);
 #endif
 
 #if defined(OS_WIN)
   SIZE ToSIZE() const;
 #elif defined(OS_MACOSX)
   CGSize ToCGSize() const;
 #endif
 
   operator SizeF() const {
-    return SizeF(width(), height());
+    return SizeF(static_cast<float>(width()), static_cast<float>(height()));
   }
 
   std::string ToString() const;
 };
 
 inline bool operator==(const Size& lhs, const Size& rhs) {
   return lhs.width() == rhs.width() && lhs.height() == rhs.height();
 }
 
 inline bool operator!=(const Size& lhs, const Size& rhs) {
   return !(lhs == rhs);
 }
 
 #if !defined(COMPILER_MSVC) && !defined(__native_client__)
 extern template class SizeBase<Size, int>;
 #endif
 
 // This is declared here for use in gtest-based unit tests but is defined in
 // the gfx_test_support target. Depend on that to use this in your unit test.
 // This should not be used in production code - call ToString() instead.
 void PrintTo(const Size& size, ::std::ostream* os);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GEOMETRY_SIZE_H_