test_runner: Move three Mock* files into content namespace.

content/shell/renderer/test_runner/MockGrammarCheck.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 CONTENT_SHELL_RENDERER_TEST_RUNNER_MOCKGRAMMARCHECK_H_
 #define CONTENT_SHELL_RENDERER_TEST_RUNNER_MOCKGRAMMARCHECK_H_
 
 #include <vector>
 
 namespace blink {
-
 class WebString;
 struct WebTextCheckingResult;
-
 }
 
-namespace WebTestRunner {
+namespace content {
 
 // 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 content
 
-#endif // MockSpellCheck_h
+#endif  // CONTENT_SHELL_RENDERER_TEST_RUNNER_MOCKGRAMMARCHECK_H_