Add a new GetInstance() method for remaining files with singleton classes under chrome/browser.

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_
 #pragma once
 
 #include "base/singleton.h"
 #include "base/values.h"
@@ skipping 47 matching lines @@
   // Does not take ownership of |value|.
   static void set_test_config_state(DictionaryValue* value);
 
  private:
   // Tests that set configuration state do so by calling
   // set_test_config_state() as part of test set up, and unsetting it
   // during tear down.  This singleton class holds a pointer to that
   // state, owned by the test code.
   class TestConfigState {
    public:
+    static TestConfigState* GetInstance();
+
     void set_config_state(DictionaryValue* config_state) {
       config_state_ = config_state;
     }
     const DictionaryValue* config_state() {
       return config_state_;
     }
    private:
     friend struct DefaultSingletonTraits<TestConfigState>;
     TestConfigState();
     DictionaryValue* config_state_;
     DISALLOW_COPY_AND_ASSIGN(TestConfigState);
   };
 
   ~ExtensionTestGetConfigFunction();
   virtual bool RunImpl();
   DECLARE_EXTENSION_FUNCTION_NAME("test.getConfig")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_TEST_API_H_