Add ContentSettingsProvider Interface.

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 445e90c1b77d083c985c065ffe6493b5528c4bfb..8a7401eee75e9133ab1bc12a72c05f492a714e12 100644
--- a/chrome/browser/content_settings/pref_content_settings_provider.h
+++ b/chrome/browser/content_settings/pref_content_settings_provider.h
@@ -20,11 +20,14 @@ class DictionaryValue;
 class PrefService;
 class Profile;
 
-class PrefContentSettingsProvider : public DefaultContentSettingsProvider,
-                                    public NotificationObserver {
+namespace content_settings {
+
+class PrefDefaultContentSettingsProvider
+    : public DefaultContentSettingsProviderInterface,
+      public NotificationObserver {
  public:
-  explicit PrefContentSettingsProvider(Profile* profile);
-  virtual ~PrefContentSettingsProvider();
+  explicit PrefDefaultContentSettingsProvider(Profile* profile);
+  virtual ~PrefDefaultContentSettingsProvider();
 
   // DefaultContentSettingsProvider implementation.
   virtual bool CanProvideDefaultSetting(ContentSettingsType content_type) const;
@@ -82,7 +85,9 @@ class PrefContentSettingsProvider : public DefaultContentSettingsProvider,
   // notifications from the preferences service that we triggered ourself.
   bool updating_preferences_;
 
-  DISALLOW_COPY_AND_ASSIGN(PrefContentSettingsProvider);
+  DISALLOW_COPY_AND_ASSIGN(PrefDefaultContentSettingsProvider);
 };
 
+}  // namespace content_settings
+
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_PREF_CONTENT_SETTINGS_PROVIDER_H_