Make infobars ignore button clicks when closing.

chrome/browser/ui/cocoa/extensions/extension_infobar_controller.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 "chrome/browser/ui/cocoa/extensions/extension_infobar_controller.h"
 
 #include <cmath>
 
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_infobar_delegate.h"
@@ skipping 210 matching lines @@
              name:NSViewFrameDidChangeNotification
            object:extensionView_];
 
   [[NSNotificationCenter defaultCenter]
       addObserver:self
          selector:@selector(adjustExtensionViewSize)
              name:NSWindowDidResizeNotification
            object:window_];
 }
 
+- (void)infobarWillClose {
+  [self disablePopUpMenu:contextMenu_.get()];
+  [super infobarWillClose];
+}
+
 - (void)extensionViewFrameChanged {
   [self adjustExtensionViewSize];
 
   AnimatableView* view = [self animatableView];
   NSRect infoBarFrame = [view frame];
   CGFloat newHeight = [self clampedExtensionViewHeight] + kBottomBorderHeightPx;
   [infoBarView_ setPostsFrameChangedNotifications:NO];
   infoBarFrame.size.height = newHeight;
   [infoBarView_ setFrame:infoBarFrame];
   [infoBarView_ setPostsFrameChangedNotifications:YES];
@@ skipping 22 matching lines @@
 
 InfoBar* ExtensionInfoBarDelegate::CreateInfoBar(TabContentsWrapper* owner) {
   NSWindow* window =
       [(NSView*)owner->tab_contents()->GetContentNativeView() window];
   ExtensionInfoBarController* controller =
       [[ExtensionInfoBarController alloc] initWithDelegate:this
                                                      owner:owner
                                                     window:window];
   return new InfoBar(controller, this);
 }