Disable the Context Menu in the tab-modal signin dialog.

chrome/browser/ui/signin_view_controller_delegate.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/signin_view_controller_delegate.h"
 
 #include "base/bind.h"
 #include "base/values.h"
 #include "chrome/browser/ui/signin_view_controller.h"
 #include "chrome/browser/ui/webui/signin/get_auth_frame.h"
@@ skipping 49 matching lines @@
 }
 
 void SigninViewControllerDelegate::PerformNavigation() {
   if (CanGoBack(web_contents_)) {
     auto auth_web_contents = GetAuthFrameWebContents(web_contents_);
     auth_web_contents->GetController().GoBack();
   } else {
     CloseModalSignin();
   }
 }
+
+bool SigninViewControllerDelegate::HandleContextMenu(

[sky, 2016/06/23 19:13:24]

make order match position in header.

[anthonyvd, 2016/06/27 15:28:16]

Good catch, most of the file was out of order. Done.

+    const content::ContextMenuParams& params) {
+  // Discard the context menu
+  return true;
+}