Fix sizing issues in the tab modal signin flow.

chrome/browser/ui/webui/signin/sync_confirmation_handler.h

Index: chrome/browser/ui/webui/signin/sync_confirmation_handler.h
diff --git a/chrome/browser/ui/webui/signin/sync_confirmation_handler.h b/chrome/browser/ui/webui/signin/sync_confirmation_handler.h
index cb3506a7030b6861d8c70afe9e32015047d76033..5047307f04464df7a588ed63778ff7e15ecb6d55 100644
--- a/chrome/browser/ui/webui/signin/sync_confirmation_handler.h
+++ b/chrome/browser/ui/webui/signin/sync_confirmation_handler.h
@@ -52,6 +52,11 @@ class SyncConfirmationHandler : public content::WebUIMessageHandler,
   // sync settings page for configuration before starting sync.
   virtual void HandleGoToSettings(const base::ListValue* args);
 
+  // Handles the web ui message sent when the html content is done being laid
+  // out and it's time to resize the native view hosting it to fit. |args| is
+  // a single integer value for the height the native view should resize to.
+  virtual void HandleResizeNativeView(const base::ListValue* args);
+
   // Sets the profile picture shown in the dialog to the image at |url|.
   virtual void SetUserImageURL(const std::string& url);