Eliminate InfoBarTabHelper. Make InfoBarService a concrete class.

chrome/browser/ui/cocoa/infobars/extension_infobar_controller.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.
 
 #import "chrome/browser/ui/cocoa/infobars/extension_infobar_controller.h"
 
 #include <cmath>
 
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_infobar_delegate.h"
@@ skipping 134 matching lines @@
                  owner:(InfoBarService*)owner
                 window:(NSWindow*)window {
   if ((self = [super initWithDelegate:delegate owner:owner])) {
     window_ = window;
     dropdownButton_.reset([[MenuButton alloc] init]);
     [dropdownButton_ setOpenMenuOnClick:YES];
 
     extensions::ExtensionHost* extensionHost =
         delegate_->AsExtensionInfoBarDelegate()->extension_host();
     Browser* browser =
-        chrome::FindBrowserWithWebContents(owner->GetWebContents());
+        chrome::FindBrowserWithWebContents(owner->web_contents());
     contextMenu_.reset([[ExtensionActionContextMenu alloc]
         initWithExtension:extensionHost->extension()
                   browser:browser
           extensionAction:NULL]);
     // See menu_button.h for documentation on why this is needed.
     NSMenuItem* dummyItem =
         [[[NSMenuItem alloc] initWithTitle:@""
                                     action:nil
                              keyEquivalent:@""] autorelease];
     [contextMenu_ insertItem:dummyItem atIndex:0];
@@ skipping 103 matching lines @@
 }
 
 - (void)setButtonImage:(NSImage*)image {
   [dropdownButton_ setImage:image];
 }
 
 @end
 
 InfoBar* ExtensionInfoBarDelegate::CreateInfoBar(InfoBarService* owner) {
   NSWindow* window =
-      [(NSView*)owner->GetWebContents()->GetView()->GetContentNativeView()
+      [(NSView*)owner->web_contents()->GetView()->GetContentNativeView()
           window];
   ExtensionInfoBarController* controller =
       [[ExtensionInfoBarController alloc] initWithDelegate:this
                                                      owner:owner
                                                     window:window];
   return new InfoBar(controller, this);
 }