Move ExtensionFunction to the extensions component.

extensions/browser/extension_function.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_H_
-#define CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_H_
+#ifndef EXTENSIONS_BROWSER_EXTENSION_FUNCTION_H_
+#define EXTENSIONS_BROWSER_EXTENSION_FUNCTION_H_
 
 #include <list>
 #include <string>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/process.h"
@@ skipping 408 matching lines @@
 class SyncIOThreadExtensionFunction : public IOThreadExtensionFunction {
  public:
   SyncIOThreadExtensionFunction();
 
   virtual void Run() OVERRIDE;
 
  protected:
   virtual ~SyncIOThreadExtensionFunction();
 };
 
-#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_H_
+#endif  // EXTENSIONS_BROWSER_EXTENSION_FUNCTION_H_