Switch from PrintTo to operator<< for platform printers

third_party/WebKit/Source/platform/testing/TransformPrinters.h

-// Copyright 2015 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 TransformPrinters_h
-#define TransformPrinters_h
-
-#include <iosfwd>
-
-namespace blink {
-
-class AffineTransform;
-class TransformationMatrix;
-
-// GTest print support for platform transform classes.
-//
-// To avoid ODR violations, these should also be declared in the respective
-// headers defining these types. This is required because otherwise a template
-// instantiation may be instantiated differently, depending on whether this
-// declaration is found.
-//
-// As a result, it is not necessary to include this file in tests in order to
-// use these printers. If, however, you get a link error about these symbols,
-// you need to make sure the blink_platform_test_support target is linked in
-// your unit test binary.
-void PrintTo(const AffineTransform&, std::ostream*);
-void PrintTo(const TransformationMatrix&, std::ostream*);
-
-} // namespace blink
-
-#endif // TransformPrinters_h