chrome: Cleanup class/struct forward declarations

chrome/browser/ui/cocoa/infobars/infobar_container_controller.h

Index: chrome/browser/ui/cocoa/infobars/infobar_container_controller.h
diff --git a/chrome/browser/ui/cocoa/infobars/infobar_container_controller.h b/chrome/browser/ui/cocoa/infobars/infobar_container_controller.h
index 99b437fb1b04f012186a78db3963b20c423a2ac2..0946ce6f6209e11a609bbd78eb3f39c1a7a037ce 100644
--- a/chrome/browser/ui/cocoa/infobars/infobar_container_controller.h
+++ b/chrome/browser/ui/cocoa/infobars/infobar_container_controller.h
@@ -16,16 +16,11 @@
 @class InfoBarController;
 class InfoBarCocoa;
 class InfoBarContainerCocoa;
-class TabStripModel;
 
 namespace content {
 class WebContents;
 }
 
-namespace infobars {
-class InfoBarDelegate;
-}
-
 // Protocol for basic container methods, as needed by an InfoBarController.
 // This protocol exists to make mocking easier in unittests.
 @protocol InfoBarContainerControllerBase