Small cleanup to extension function registration to avoid scattered definitions.

chrome/browser/extensions/extension_test_api.h

 // Copyright (c) 2009 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_TEST_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_TEST_API_H_
 
 #include "chrome/browser/extensions/extension_function.h"
 
-// Function names.
-namespace extension_test_api_functions {
-  extern const char kPassFunction[];
-  extern const char kFailFunction[];
-  extern const char kLogFunction[];
-};  // namespace extension_test_api_functions
-
 class ExtensionTestPassFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("test.notifyPass")
 };
 
 class ExtensionTestFailFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("test.notifyFail")
 };
 
 class ExtensionTestLogFunction : public SyncExtensionFunction {
   virtual bool RunImpl();
+  DECLARE_EXTENSION_FUNCTION_NAME("test.log")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TEST_API_H_