chrome: Cleanup class/struct forward declarations

chrome/browser/extensions/extension_function_test_utils.h

 // Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_TEST_UTILS_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_TEST_UTILS_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "extensions/common/manifest.h"
 
 class Browser;
 class UIThreadExtensionFunction;
 
 namespace base {
 class Value;
 class DictionaryValue;
 class ListValue;
 }
 
-namespace extensions {
-class Extension;
-}
-
 // TODO(ckehoe): Accept args as std::unique_ptr<base::Value>,
 // and migrate existing users to the new API.
 // This file is DEPRECATED. New tests should use the versions in
 // extensions/browser/api_test_utils.h.
 namespace extension_function_test_utils {
 
 // Parse JSON and return as the specified type, or NULL if the JSON is invalid
 // or not the specified type.
 base::Value* ParseJSON(const std::string& data);
 base::ListValue* ParseList(const std::string& data);
@@ skipping 52 matching lines @@
                  Browser* browser,
                  RunFunctionFlags flags);
 bool RunFunction(UIThreadExtensionFunction* function,
                  std::unique_ptr<base::ListValue> args,
                  Browser* browser,
                  RunFunctionFlags flags);
 
 } // namespace extension_function_test_utils
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_TEST_UTILS_H_