Switch from PrintTo to operator<< for platform printers

third_party/WebKit/Source/platform/geometry/IntSize.h

 /*
  * Copyright (C) 2003, 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 160 matching lines @@
 inline bool operator==(const IntSize& a, const IntSize& b)
 {
     return a.width() == b.width() && a.height() == b.height();
 }
 
 inline bool operator!=(const IntSize& a, const IntSize& b)
 {
     return a.width() != b.width() || a.height() != b.height();
 }
 
-// Redeclared here to avoid ODR issues.
-// See platform/testing/GeometryPrinters.h.
-void PrintTo(const IntSize&, std::ostream*);
+PLATFORM_EXPORT std::ostream& operator<<(std::ostream&, const IntSize&);
 
 } // namespace blink
 
 #endif // IntSize_h