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 ef8cb2862df4a548275cea666c6aa2aeeec87588..7026f51168acfe4036df5c2501ddd62e3c2bc1a5 100644
--- a/chrome/browser/ui/cocoa/infobars/extension_infobar_controller.mm
+++ b/chrome/browser/ui/cocoa/infobars/extension_infobar_controller.mm
@@ -150,7 +150,7 @@ 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
@@ -272,12 +272,13 @@ 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);
 }