Fix notifications being too large on OSX.

chrome/browser/notifications/balloon_host.cc

 // Copyright (c) 2010 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 "chrome/browser/notifications/balloon_host.h"
 
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/notifications/balloon.h"
 #include "chrome/browser/notifications/notification.h"
@@ skipping 100 matching lines @@
 void BalloonHost::Close(RenderViewHost* render_view_host) {
   balloon_->CloseByScript();
   NotifyDisconnect();
 }
 
 void BalloonHost::RenderViewCreated(RenderViewHost* render_view_host) {
   render_view_host->Send(new ViewMsg_DisableScrollbarsForSmallWindows(
       render_view_host->routing_id(), balloon_->min_scrollbar_size()));
   render_view_host->WasResized();
 #if !defined(OS_MACOSX)
+  // TODO(levin): Make all of the code that went in originally with this change
+  // to be cross-platform. See http://crbug.com/64720
   render_view_host->EnablePreferredSizeChangedMode(
       kPreferredSizeWidth | kPreferredSizeHeightThisIsSlow);
 #endif
 }
 
 void BalloonHost::RenderViewReady(RenderViewHost* render_view_host) {
   should_notify_on_disconnect_ = true;
   NotificationService::current()->Notify(
       NotificationType::NOTIFY_BALLOON_CONNECTED,
       Source<BalloonHost>(this), NotificationService::NoDetails());
@@ skipping 130 matching lines @@
 
 void BalloonHost::NotifyDisconnect() {
   if (!should_notify_on_disconnect_)
     return;
 
   should_notify_on_disconnect_ = false;
   NotificationService::current()->Notify(
       NotificationType::NOTIFY_BALLOON_DISCONNECTED,
       Source<BalloonHost>(this), NotificationService::NoDetails());
 }