Introduce InfoBarTabService API.

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

Index: chrome/browser/ui/cocoa/infobars/media_stream_infobar_controller.mm
diff --git a/chrome/browser/ui/cocoa/infobars/media_stream_infobar_controller.mm b/chrome/browser/ui/cocoa/infobars/media_stream_infobar_controller.mm
index b3647343ecf4058b0a055e72a93dc42a8e8fd2e9..44b4fa61dd3d45b2cbf4beb81ff76ef673791403 100644
--- a/chrome/browser/ui/cocoa/infobars/media_stream_infobar_controller.mm
+++ b/chrome/browser/ui/cocoa/infobars/media_stream_infobar_controller.mm
@@ -9,6 +9,7 @@
 
 #import "base/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/infobars/infobar_tab_helper.h"
 #include "chrome/browser/media/media_stream_devices_menu_model.h"
 #include "chrome/browser/ui/cocoa/hover_close_button.h"
 #include "chrome/browser/ui/cocoa/infobars/infobar.h"
@@ -23,10 +24,11 @@ using InfoBarUtilities::MoveControl;
 using InfoBarUtilities::VerifyControlOrderAndSpacing;
 using l10n_util::GetNSStringWithFixup;
 
-InfoBar* MediaStreamInfoBarDelegate::CreateInfoBar(InfoBarTabHelper* owner) {
+InfoBar* MediaStreamInfoBarDelegate::CreateInfoBar(InfoBarTabService* owner) {
+  InfoBarTabHelper* helper = (InfoBarTabHelper*)owner;
   MediaStreamInfoBarController* infobar_controller =

[erikwright (departed), 2012/08/20 05:54:46]

Again, perhaps converting MediaStreamInfoBarController and removing the cast
would be worthwhile.

[Jói, 2012/08/20 12:30:15]

Done.

       [[MediaStreamInfoBarController alloc] initWithDelegate:this
-                                                       owner:owner];
+                                                       owner:helper];
   return new InfoBar(infobar_controller, this);
 }