Make panel adjust bounds per preferred size change notification on Windows.

chrome/browser/tab_contents/tab_contents_view_mac.mm

 // Copyright (c) 2011 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.
 
 #import <Carbon/Carbon.h>
 
 #include "chrome/browser/tab_contents/tab_contents_view_mac.h"
 
 #include <string>
 
@@ skipping 217 matching lines @@
     // the field when we navigated away from it, we should restore
     // that selection.
     SetInitialFocus();
   }
 
   focus_tracker_.reset(nil);
 }
 
 void TabContentsViewMac::UpdatePreferredSize(const gfx::Size& pref_size) {
   preferred_width_ = pref_size.width();
+  if (tab_contents_->delegate())
+    tab_contents_->delegate()->UpdatePreferredSize(tab_contents_, pref_size);
 }
 
 bool TabContentsViewMac::IsDoingDrag() const {
   return false;
 }
 
 void TabContentsViewMac::CancelDragAndCloseTab() {
 }
 
 void TabContentsViewMac::UpdateDragCursor(WebDragOperation operation) {
@@ skipping 328 matching lines @@
       [[[notification userInfo] objectForKey:kSelectionDirection]
         unsignedIntegerValue];
   if (direction == NSDirectSelection)
     return;
 
   [self tabContents]->
       FocusThroughTabTraversal(direction == NSSelectingPrevious);
 }
 
 @end