Add a content_settings::BaseProvider for code that is shared by all content settings providers.

chrome/browser/content_settings/pref_content_settings_provider.h

Index: chrome/browser/content_settings/pref_content_settings_provider.h
diff --git a/chrome/browser/content_settings/pref_content_settings_provider.h b/chrome/browser/content_settings/pref_content_settings_provider.h
index b4631b8d9e79017beb2d5f79e2a8a5370068ab6e..c905d567e35fd21936bf06f44e870d65fbb8557f 100644
--- a/chrome/browser/content_settings/pref_content_settings_provider.h
+++ b/chrome/browser/content_settings/pref_content_settings_provider.h
@@ -14,6 +14,7 @@
 
 #include "base/basictypes.h"
 #include "base/synchronization/lock.h"
+#include "chrome/browser/content_settings/content_settings_base_provider.h"
 #include "chrome/browser/content_settings/content_settings_provider.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 #include "chrome/common/notification_observer.h"
@@ -90,7 +91,9 @@ class PrefDefaultProvider : public DefaultProviderInterface,
   DISALLOW_COPY_AND_ASSIGN(PrefDefaultProvider);
 };
 
-class PrefProvider : public ProviderInterface,
+// Content-settings-provider that provides content-settings from the user
+// preference.
+class PrefProvider : public BaseProvider,
                      public NotificationObserver {
  public:
   static void RegisterUserPrefs(PrefService* prefs);
@@ -102,12 +105,6 @@ class PrefProvider : public ProviderInterface,
   virtual bool ContentSettingsTypeIsManaged(
       ContentSettingsType content_type);
 
-  virtual ContentSetting GetContentSetting(
-      const GURL& requesting_url,
-      const GURL& embedding_url,
-      ContentSettingsType content_type,
-      const ResourceIdentifier& resource_identifier) const;
-
   virtual void SetContentSetting(
       const ContentSettingsPattern& requesting_pattern,
       const ContentSettingsPattern& embedding_pattern,
@@ -115,43 +112,27 @@ class PrefProvider : public ProviderInterface,
       const ResourceIdentifier& resource_identifier,
       ContentSetting content_setting);
 
-  virtual void GetAllContentSettingsRules(
-      ContentSettingsType content_type,
-      const ResourceIdentifier& resource_identifier,
-      Rules* content_setting_rules) const;
-
   virtual void ClearAllContentSettingsRules(
       ContentSettingsType content_type);
 
   virtual void ResetToDefaults();
 
+  // BaseProvider implementations.
+  virtual void Init();
+
   // NotificationObserver implementation.
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
  private:
-  typedef std::pair<ContentSettingsType, std::string>
-      ContentSettingsTypeResourceIdentifierPair;
-  typedef std::map<ContentSettingsTypeResourceIdentifierPair, ContentSetting>
-      ResourceContentSettings;
-
-  struct ExtendedContentSettings;
-
-  typedef std::map<std::string, ExtendedContentSettings> HostContentSettings;
+  void ReadExceptions(bool overwrite);
 
   // Various migration methods (old cookie, popup and per-host data gets
   // migrated to the new format).
   void MigrateObsoletePerhostPref(PrefService* prefs);
   void MigrateObsoletePopupsPref(PrefService* prefs);
 
-  bool AllDefault(const ExtendedContentSettings& settings) const;
-
-  void ReadExceptions(bool overwrite);
-
-  bool RequiresResourceIdentifier(
-      ContentSettingsType content_type) const;
-
   void CanonicalizeContentSettingsExceptions(
       DictionaryValue* all_settings_dictionary);
 
@@ -169,24 +150,9 @@ class PrefProvider : public ProviderInterface,
 
   Profile* profile_;
 
-  // Whether this settings map is for an OTR session.
-  bool is_off_the_record_;
-
-  // Used around accesses to the content_settings_ object to guarantee
-  // thread safety.
-  mutable base::Lock lock_;
-
   PrefChangeRegistrar pref_change_registrar_;
   NotificationRegistrar notification_registrar_;
 
-  // Copies of the pref data, so that we can read it on threads other than the
-  // UI thread.
-  HostContentSettings host_content_settings_;
-
-  // Differences to the preference-stored host content settings for
-  // off-the-record settings.
-  HostContentSettings off_the_record_settings_;
-
   // Whether we are currently updating preferences, this is used to ignore
   // notifications from the preferences service that we triggered ourself.
   bool updating_preferences_;
@@ -194,9 +160,6 @@ class PrefProvider : public ProviderInterface,
   // Do not fire any Notifications as long as we are in the constructor.
   bool initializing_;
 
-  // LEGACY: TBR
-  ContentSettings GetNonDefaultContentSettings(const GURL& url) const;
-
   DISALLOW_COPY_AND_ASSIGN(PrefProvider);
 };