Remove grammar checking from layout tests, and MockGrammarCheck

components/test_runner/mock_grammar_check.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_GRAMMAR_CHECK_H_
-#define COMPONENTS_TEST_RUNNER_MOCK_GRAMMAR_CHECK_H_
-
-#include <vector>
-
-namespace blink {
-class WebString;
-struct WebTextCheckingResult;
-}
-
-namespace test_runner {
-
-// A mock implementation of a grammar-checker used for WebKit tests. This class
-// only implements the minimal functionarities required by WebKit tests, i.e.
-// this class just compares the given string with known grammar mistakes in
-// webkit tests and adds grammar markers on them. Even though this is sufficent
-// for webkit tests, this class is not suitable for any other usages.
-class MockGrammarCheck {
- public:
-  static bool CheckGrammarOfString(const blink::WebString&,
-                                   std::vector<blink::WebTextCheckingResult>*);
-};
-
-}  // namespace test_runner
-
-#endif  // COMPONENTS_TEST_RUNNER_MOCK_GRAMMAR_CHECK_H_