Cleanup: Remove unneeded forward declarations from various chrome/browser subdirectories.

chrome/browser/content_settings/content_settings_provider.h

 // Copyright (c) 2011 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.
 
 // Interface for objects providing content setting rules.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_
 #pragma once
 
 #define NO_RESOURCE_IDENTIFIER ""
 
 #include <string>
 #include <vector>
 
 #include "base/values.h"
 #include "chrome/common/content_settings.h"
 
 class ContentSettingsPattern;
-class GURL;
 
 namespace content_settings {
 
 struct Rule;
 class RuleIterator;
 
 typedef std::string ResourceIdentifier;
 
 class ProviderInterface {
  public:
@@ skipping 37 matching lines @@
   // Detaches the Provider from all Profile-related objects like PrefService.
   // This methods needs to be called before destroying the Profile.
   // Afterwards, none of the methods above that should only be called on the UI
   // thread should be called anymore.
   virtual void ShutdownOnUIThread() = 0;
 };
 
 }  // namespace content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_PROVIDER_H_