Convert string16 to base::string16 in content.

content/public/common/show_desktop_notification_params.h

Index: content/public/common/show_desktop_notification_params.h
diff --git a/content/public/common/show_desktop_notification_params.h b/content/public/common/show_desktop_notification_params.h
index d31f9479ed1037fbe29f6df19c5a3e52f237e774..5ff4511a472a4aac49ee078737f7b19568435425 100644
--- a/content/public/common/show_desktop_notification_params.h
+++ b/content/public/common/show_desktop_notification_params.h
@@ -21,15 +21,15 @@ struct CONTENT_EXPORT ShowDesktopNotificationHostMsgParams {
 
   // Contents of the notification if is_html is false.
   GURL icon_url;
-  string16 title;
-  string16 body;
+  base::string16 title;
+  base::string16 body;
 
   // Directionality of the notification.
   blink::WebTextDirection direction;
 
   // ReplaceID if this notification should replace an existing one; may be
   // empty if no replacement is called for.
-  string16 replace_id;
+  base::string16 replace_id;
 
   // Notification ID for sending events back for this notification.
   int notification_id;