chrome: Cleanup class/struct forward declarations

chrome/browser/ui/browser_dialogs.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_UI_BROWSER_DIALOGS_H_
 #define CHROME_BROWSER_UI_BROWSER_DIALOGS_H_
 
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 26 matching lines @@
 class BrowserContext;
 class ColorChooser;
 class WebContents;
 }
 
 namespace extensions {
 class Extension;
 }
 
 namespace gfx {
-class Image;
 class Point;
 }
 
 namespace net {
 class AuthChallengeInfo;
 class URLRequest;
 }
 
 namespace security_state {
 struct SecurityInfo;
@@ skipping 144 matching lines @@
 using BubbleShowPtr =
     void (*)(content::WebContents*,
              const std::vector<arc::ArcNavigationThrottle::AppInfo>&,
              const IntentPickerResponse&);
 
 BubbleShowPtr ShowIntentPickerBubble();
 
 #endif  // OS_CHROMEOS
 
 #endif  // CHROME_BROWSER_UI_BROWSER_DIALOGS_H_