InfoBarService inherits from InfoBarManager

chrome/browser/infobars/infobar_delegate.cc

 // 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 "chrome/browser/infobars/infobar_delegate.h"
 
 #include "base/logging.h"
 #include "build/build_config.h"
 #include "chrome/browser/infobars/infobar.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_details.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/web_contents.h"
 #include "ui/base/resource/resource_bundle.h"
 
+namespace {
+content::WebContents* WebContentsFromInfoBar(InfoBar* infobar) {

[droger, 2014/04/08 12:11:00]

The plan would be to make this helper function public so that any infobar
delegate that needs it can use it instead of InfoBarDelegate::web_contents().

+  if (!infobar || !infobar->owner())
+    return NULL;
+
+  InfoBarService* infobar_service =
+      static_cast<InfoBarService*>(infobar->owner());
+  return infobar_service->web_contents();
+}
+}  // namespace
+
 using content::NavigationEntry;
 
 // InfoBarDelegate ------------------------------------------------------------
 
 const int InfoBarDelegate::kNoIconID = 0;
 
 InfoBarDelegate::~InfoBarDelegate() {
 }
 
 InfoBarDelegate::InfoBarAutomationType
@@ skipping 74 matching lines @@
   contents_unique_id_ = active_entry ? active_entry->GetUniqueID() : 0;
 }
 
 gfx::Image InfoBarDelegate::GetIcon() const {
   int icon_id = GetIconID();
   return (icon_id == kNoIconID) ? gfx::Image() :
       ResourceBundle::GetSharedInstance().GetNativeImageNamed(icon_id);
 }
 
 content::WebContents* InfoBarDelegate::web_contents() {
-  return (infobar_ && infobar_->owner()) ?
-      infobar_->owner()->web_contents() : NULL;
+  return WebContentsFromInfoBar(infobar_);
 }
 
 InfoBarDelegate::InfoBarDelegate() : contents_unique_id_(0) {
 }
 
 bool InfoBarDelegate::ShouldExpireInternal(
     const NavigationDetails& details) const {
   // NOTE: If you change this, be sure to check and adjust the behavior of
   // anyone who overrides this as necessary!
   return (contents_unique_id_ != details.entry_id) || details.is_reload;
 }