chrome: Cleanup class/struct forward declarations

chrome/browser/android/omnibox/omnibox_prerender.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 CHROME_BROWSER_ANDROID_OMNIBOX_OMNIBOX_PRERENDER_H_
 #define CHROME_BROWSER_ANDROID_OMNIBOX_OMNIBOX_PRERENDER_H_
 
 #include <memory>
 
 #include "base/android/jni_weak_ref.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 
-class AutocompleteResult;
-class ProfielAndroid;
 class Profile;
-class TabAndroid;
 struct AutocompleteMatch;
 
 namespace content {
 class WebContents;
 }
 
 // This class is responsible for taking the user's omnibox input text,
 // AutocompleteResults and navigation actions and then feeding them to the
 // AutocompleteActionPredictor. The predictor uses it to update its
 // database and returns predictions on what page, if any, to pre-render
@@ skipping 39 matching lines @@
                    Profile* profile,
                    content::WebContents* web_contents);
   JavaObjectWeakGlobalRef weak_java_omnibox_;
 
   DISALLOW_COPY_AND_ASSIGN(OmniboxPrerender);
 };
 
 bool RegisterOmniboxPrerender(JNIEnv* env);
 
 #endif  // CHROME_BROWSER_ANDROID_OMNIBOX_OMNIBOX_PRERENDER_H_