Convert most of extensions and some other random stuff to using the base namespace for Values.

chrome/browser/extensions/api/storage/settings_backend.h

Index: chrome/browser/extensions/api/storage/settings_backend.h
diff --git a/chrome/browser/extensions/api/storage/settings_backend.h b/chrome/browser/extensions/api/storage/settings_backend.h
index 9de4f0ed9e5e2f1b8ff898067eabd3894791fbec..0882b68ed3538996b8767075c802c5813026b9c3 100644
--- a/chrome/browser/extensions/api/storage/settings_backend.h
+++ b/chrome/browser/extensions/api/storage/settings_backend.h
@@ -72,7 +72,7 @@ class SettingsBackend : public syncer::SyncableService {
   // initializing sync with some initial data if sync enabled.
   SyncableSettingsStorage* GetOrCreateStorageWithSyncData(
       const std::string& extension_id,
-      const DictionaryValue& sync_data) const;
+      const base::DictionaryValue& sync_data) const;
 
   // Gets all extension IDs known to extension settings.  This may not be all
   // installed extensions.