Introduce InfoBarTabService API.

chrome/browser/ui/cocoa/infobars/extension_infobar_controller.mm

Index: chrome/browser/ui/cocoa/infobars/extension_infobar_controller.mm
diff --git a/chrome/browser/ui/cocoa/infobars/extension_infobar_controller.mm b/chrome/browser/ui/cocoa/infobars/extension_infobar_controller.mm
index 5d867b58c912b2bf7bc4910369bdc694c2bdd9af..339a9f080000254d25b79f491d9aa6c5da889d6e 100644
--- a/chrome/browser/ui/cocoa/infobars/extension_infobar_controller.mm
+++ b/chrome/browser/ui/cocoa/infobars/extension_infobar_controller.mm
@@ -149,7 +149,7 @@ class InfobarBridge : public ExtensionInfoBarDelegate::DelegateObserver,
     extensions::ExtensionHost* extensionHost =
         delegate_->AsExtensionInfoBarDelegate()->extension_host();
     Browser* browser =
-        browser::FindBrowserWithWebContents(owner->web_contents());
+        browser::FindBrowserWithWebContents(owner->GetWebContents());
     contextMenu_.reset([[ExtensionActionContextMenu alloc]
         initWithExtension:extensionHost->extension()
                   browser:browser
@@ -271,12 +271,13 @@ class InfobarBridge : public ExtensionInfoBarDelegate::DelegateObserver,
 
 @end
 
-InfoBar* ExtensionInfoBarDelegate::CreateInfoBar(InfoBarTabHelper* owner) {
+InfoBar* ExtensionInfoBarDelegate::CreateInfoBar(InfoBarTabService* owner) {
+  InfoBarTabHelper* helper = (InfoBarTabHelper*)owner;
   NSWindow* window =
-      [(NSView*)owner->web_contents()->GetContentNativeView() window];
+      [(NSView*)owner->GetWebContents()->GetContentNativeView() window];
   ExtensionInfoBarController* controller =
       [[ExtensionInfoBarController alloc] initWithDelegate:this
-                                                     owner:owner
+                                                     owner:helper
                                                     window:window];
   return new InfoBar(controller, this);
 }