Detach the dependency from host_content_settings_map to extension.

chrome/browser/content_settings/host_content_settings_map.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.
 
 // Maps hostnames to custom content settings.  Written on the UI thread and read
 // on any thread.  One instance per profile.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_HOST_CONTENT_SETTINGS_MAP_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_HOST_CONTENT_SETTINGS_MAP_H_
 
-#include <map>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
+#include "base/memory/scoped_vector.h"
 #include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/threading/platform_thread.h"
 #include "base/tuple.h"
 #include "chrome/browser/content_settings/content_settings_observer.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"
 
 class ExtensionService;
 class GURL;
 class PrefService;
 
 namespace base {
 class Clock;
 class Value;
 }
 
 namespace content_settings {
+class DefaultProvider;
+class ObservableProvider;
 class ProviderInterface;
 class PrefProvider;
 }
 
 namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
 class HostContentSettingsMap
     : public content_settings::Observer,
       public base::RefCountedThreadSafe<HostContentSettingsMap> {
  public:
-  enum ProviderType {
-    INTERNAL_EXTENSION_PROVIDER = 0,
-    POLICY_PROVIDER,
-    CUSTOM_EXTENSION_PROVIDER,
-    PREF_PROVIDER,
-    DEFAULT_PROVIDER,
-    NUM_PROVIDER_TYPES,
-  };
-
   HostContentSettingsMap(PrefService* prefs, bool incognito);
 
-#if defined(ENABLE_EXTENSIONS)
-  // In some cases, the ExtensionService is not available at the time the
-  // HostContentSettingsMap is constructed. In these cases, we register the
-  // service once it's available.
-  void RegisterExtensionService(ExtensionService* extension_service);
-#endif
+  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
-  static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
+  // Adds a new provider for |type|.
+  void RegisterProvider(
+      scoped_ptr<content_settings::ObservableProvider> provider);
+
+  // Gets the number of providers it has.
+  size_t GetNumProviders() const;
+
+  // Gets the i-th provider.
+  const content_settings::ProviderInterface* GetProviderAt(size_t i) const;
 
   // Returns the default setting for a particular content type. If |provider_id|
   // is not NULL, the id of the provider which provided the default setting is
   // assigned to it.
   //
   // This may be called on any thread.
   ContentSetting GetDefaultContentSetting(ContentSettingsType content_type,
                                           std::string* provider_id) const;
 
   // Returns a single |ContentSetting| which applies to the given URLs.  Note
@@ skipping 118 matching lines @@
       ContentSettingsType content_type,
       std::string resource_identifier) OVERRIDE;
 
   // Returns true if we should allow all content types for this URL.  This is
   // true for various internal objects like chrome:// URLs, so UI and other
   // things users think of as "not webpages" don't break.
   static bool ShouldAllowAllContent(const GURL& primary_url,
                                     const GURL& secondary_url,
                                     ContentSettingsType content_type);
 
-  // Returns the ProviderType associated with the given source string.
-  // TODO(estade): I regret adding this. At the moment there are no legitimate
-  // uses. We should stick to ProviderType rather than string so we don't have
-  // to convert backwards.
-  static ProviderType GetProviderTypeFromSource(const std::string& source);
-
   bool is_off_the_record() const {
     return is_off_the_record_;
   }
 
   // Returns a single |ContentSetting| which applies to the given URLs, just as
   // |GetContentSetting| does. If the setting is allowed, it also records the
   // last usage to preferences.
   //
   // This should only be called on the UI thread, unlike |GetContentSetting|.
   ContentSetting GetContentSettingAndMaybeUpdateLastUsage(
@@ skipping 31 matching lines @@
   void AddObserver(content_settings::Observer* observer);
   void RemoveObserver(content_settings::Observer* observer);
 
   // Passes ownership of |clock|.
   void SetPrefClockForTesting(scoped_ptr<base::Clock> clock);
 
  private:
   friend class base::RefCountedThreadSafe<HostContentSettingsMap>;
   friend class HostContentSettingsMapTest_NonDefaultSettings_Test;
 
-  typedef std::map<ProviderType, content_settings::ProviderInterface*>
-      ProviderMap;
-  typedef ProviderMap::iterator ProviderIterator;
-  typedef ProviderMap::const_iterator ConstProviderIterator;
+  typedef ScopedVector<content_settings::ProviderInterface> ProviderList;
+  typedef ProviderList::iterator ProviderIterator;
+  typedef ProviderList::const_iterator ConstProviderIterator;
 
   virtual ~HostContentSettingsMap();
 
   ContentSetting GetDefaultContentSettingFromProvider(
       ContentSettingsType content_type,
       content_settings::ProviderInterface* provider) const;
 
   // Migrate the Clear on exit pref into equivalent content settings.
   void MigrateObsoleteClearOnExitPref();
 
   // Adds content settings for |content_type| and |resource_identifier|,
   // provided by |provider|, into |settings|. If |incognito| is true, adds only
   // the content settings which are applicable to the incognito mode and differ
   // from the normal mode. Otherwise, adds the content settings for the normal
   // mode.
   void AddSettingsForOneType(
       const content_settings::ProviderInterface* provider,
-      ProviderType provider_type,
       ContentSettingsType content_type,
       const std::string& resource_identifier,
       ContentSettingsForOneType* settings,
       bool incognito) const;
 
   // Call UsedContentSettingsProviders() whenever you access
   // content_settings_providers_ (apart from initialization and
   // teardown), so that we can DCHECK in RegisterExtensionService that
   // it is not being called too late.
   void UsedContentSettingsProviders() const;
 
-  content_settings::PrefProvider* GetPrefProvider();
-
 #ifndef NDEBUG
   // This starts as the thread ID of the thread that constructs this
   // object, and remains until used by a different thread, at which
   // point it is set to base::kInvalidThreadId. This allows us to
   // DCHECK on unsafe usage of content_settings_providers_ (they
   // should be set up on a single thread, after which they are
   // immutable).
   mutable base::PlatformThreadId used_from_thread_id_;
 #endif
 
   // Weak; owned by the Profile.
   PrefService* prefs_;
 
   // Whether this settings map is for an OTR session.
   bool is_off_the_record_;
 
   // Content setting providers. This is only modified at construction
   // time and by RegisterExtensionService, both of which should happen
   // before any other uses of it.
-  ProviderMap content_settings_providers_;
+  ProviderList content_settings_providers_;
+
+  // Keeping the pointers to specific type of the provider.
+  content_settings::DefaultProvider* default_provider_;
+  content_settings::PrefProvider* pref_provider_;
 
   ObserverList<content_settings::Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(HostContentSettingsMap);
 };
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_HOST_CONTENT_SETTINGS_MAP_H_