extensions: Add ExtensionView interface.

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 d779b7f13e4b72529d0d160838ffb2150e48d88e..ca66f71acbcf57892e18bd07983d82ae28a0b86e 100644
--- a/chrome/browser/ui/cocoa/infobars/extension_infobar_controller.mm
+++ b/chrome/browser/ui/cocoa/infobars/extension_infobar_controller.mm
@@ -9,6 +9,7 @@
 #include "chrome/browser/api/infobars/infobar_service.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_infobar_delegate.h"
+#include "chrome/browser/extensions/extension_view.h"
 #include "chrome/browser/extensions/image_loading_tracker.h"
 #include "chrome/browser/ui/browser_finder.h"
 #import "chrome/browser/ui/cocoa/animatable_view.h"
@@ -177,7 +178,7 @@ class InfobarBridge : public ExtensionInfoBarDelegate::DelegateObserver,
   [self removeButtons];
 
   extensionView_ = delegate_->AsExtensionInfoBarDelegate()->extension_host()->
-      view()->native_view();
+      GetExtensionView()->GetNativeView();
 
   // Add the extension's RenderWidgetHostView to the view hierarchy of the
   // InfoBar and make sure to place it below the Close button.