Move the Notification browser tests down to //content.

content/browser/notifications/notification_message_filter.h

Index: content/browser/notifications/notification_message_filter.h
diff --git a/content/browser/notifications/notification_message_filter.h b/content/browser/notifications/notification_message_filter.h
index 8f400a681fb1601108dd52267d507e720e246a70..5a56241d669d02bc5c13c3e2fa46d82bc7339a70 100644
--- a/content/browser/notifications/notification_message_filter.h
+++ b/content/browser/notifications/notification_message_filter.h
@@ -96,15 +96,24 @@ class CONTENT_EXPORT NotificationMessageFilter : public BrowserMessageFilter {
   // cases where the renderer shouldn't send messages if it weren't the case. If
   // no permission has been granted, a bad message has been received and the
   // renderer should be killed accordingly.
-  bool VerifyNotificationPermissionGranted(
-      PlatformNotificationService* service,
-      const GURL& origin);
+  bool VerifyNotificationPermissionGranted(const GURL& origin);
+
+  // Sets the PlatformNotificationService instance to use for tests. The test is
+  // expected to clean up after themselves and reset this variable.
+  static void SetNotificationServiceForTests(
+      PlatformNotificationService* service) {
+    service_ = service;
+  }
+
+  PlatformNotificationService* service() const;
 
   int process_id_;
   scoped_refptr<PlatformNotificationContextImpl> notification_context_;
   ResourceContext* resource_context_;
   BrowserContext* browser_context_;
 
+  static PlatformNotificationService* service_;
+
   // Map mapping notification ids to their associated close closures.
   std::map<int, base::Closure> close_closures_;