Cleanup: Fix content header include guards.

content/renderer/ime_event_guard.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 IME_EVENT_GUARD_H_
-#define IME_EVENT_GUARD_H_
+#ifndef CONTENT_RENDERER_IME_EVENT_GUARD_H_
+#define CONTENT_RENDERER_IME_EVENT_GUARD_H_
 
 namespace content {
 class RenderWidget;
 
 // Simple RAII object for handling IME events. Calls StartHandlingImeEvent on
 // construction and FinishHandlingImeEvent on destruction.
 class ImeEventGuard {
  public:
   explicit ImeEventGuard(RenderWidget* widget);
   ~ImeEventGuard();
  private:
   RenderWidget* widget_;
 };
 }
 
-#endif
+#endif  // CONTENT_RENDERER_IME_EVENT_GUARD_H_