chrome: Cleanup class/struct forward declarations

chrome/browser/content_settings/chrome_content_settings_utils.h

 // Copyright (c) 2014 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_CONTENT_SETTINGS_CHROME_CONTENT_SETTINGS_UTILS_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_CHROME_CONTENT_SETTINGS_UTILS_H_
 
-class GURL;
-
 // Put utility functions only used by //chrome code here. If a function declared
 // here would be meaningfully shared with other platforms, consider moving it to
 // components/content_settings/core/browser/content_settings_utils.h.
 
 namespace content_settings {
 
 // UMA histogram for the mixed script shield. The enum values correspond to
 // histogram entries, so do not remove any existing values.
 enum MixedScriptAction {
   MIXED_SCRIPT_ACTION_DISPLAYED_SHIELD = 0,
@@ skipping 16 matching lines @@
   PLUGINS_ACTION_CLICKED_MANAGE_PLUGIN_BLOCKING,
   PLUGINS_ACTION_CLICKED_LEARN_MORE,
   PLUGINS_ACTION_COUNT
 };
 
 void RecordPluginsAction(PluginsAction action);
 
 }  // namespace content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CHROME_CONTENT_SETTINGS_UTILS_H_