Reland of Remove MockConstraints

components/test_runner/mock_constraints.h

-// Copyright 2013 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 COMPONENTS_TEST_RUNNER_MOCK_CONSTRAINTS_H_
-#define COMPONENTS_TEST_RUNNER_MOCK_CONSTRAINTS_H_
-
-namespace blink {
-class WebMediaConstraints;
-class WebString;
-}
-
-namespace test_runner {
-
-class MockConstraints {
- public:
-  static bool VerifyConstraints(const blink::WebMediaConstraints& constraints,
-                                blink::WebString* failed_constraint = 0);
-};
-
-}  // namespace test_runner
-
-#endif  // COMPONENTS_TEST_RUNNER_MOCK_CONSTRAINTS_H_