components: Cleanup class/struct fwd declarations

components/content_settings/core/browser/content_settings_utils.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 COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_UTILS_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_UTILS_H_
 
 #include <memory>
 #include <string>
 #include <utility>
 
 #include "base/compiler_specific.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "components/content_settings/core/common/content_settings_types.h"
 
 namespace base {
 class Value;
 }
 
-class GURL;
 class HostContentSettingsMap;
 
 namespace content_settings {
 
-class ProviderInterface;
-class RuleIterator;
-
 typedef std::pair<ContentSettingsPattern, ContentSettingsPattern> PatternPair;
 
 // Helper class to iterate over only the values in a map.
 template <typename IteratorType, typename ReferenceType>
 class MapValueIterator {
  public:
   explicit MapValueIterator(IteratorType iterator) : iterator_(iterator) {}
 
   bool operator!=(const MapValueIterator& other) const {
     return iterator_ != other.iterator_;
@@ skipping 46 matching lines @@
 // handled by the renderer.
 void GetRendererContentSettingRules(const HostContentSettingsMap* map,
                                     RendererContentSettingRules* rules);
 
 // Returns true if setting |a| is more permissive than setting |b|.
 bool IsMorePermissive(ContentSetting a, ContentSetting b);
 
 }  // namespace content_settings
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_UTILS_H_