Allow partial update for notification update API

chrome/browser/ui/cocoa/notifications/balloon_controller_unittest.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/notifications/balloon.h"
 #include "chrome/browser/notifications/balloon_collection.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/notification_object_proxy.h"
@@ skipping 13 matching lines @@
 @implementation TestBalloonController
 - (void)initializeHost {}
 @end
 
 namespace {
 
 // Use a dummy balloon collection for testing.
 class MockBalloonCollection : public BalloonCollection {
   virtual void Add(const Notification& notification,
                    Profile* profile) OVERRIDE {}
-  virtual bool DoesIdExist(const std::string& id) OVERRIDE { return false; }
+  virtual const Notification* FindById(const std::string& id) const OVERRIDE {
+    return NULL;
+  }
   virtual bool RemoveById(const std::string& id) OVERRIDE { return false; }
   virtual bool RemoveBySourceOrigin(const GURL& origin) OVERRIDE {
     return false;
   }
   virtual bool RemoveByProfile(Profile* profile) OVERRIDE { return false; }
   virtual void RemoveAll() OVERRIDE {}
   virtual bool HasSpace() const OVERRIDE { return true; }
   virtual void ResizeBalloon(
       Balloon* balloon,
       const gfx::Size& size) OVERRIDE {
@@ skipping 60 matching lines @@
 
   [controller showWindow:nil];
 
   EXPECT_TRUE([controller desiredTotalWidth] > 100);
   EXPECT_TRUE([controller desiredTotalHeight] > 100);
 
   [controller closeBalloon:YES];
 }
 
 }