Adding keyboard shortcut BROWSE+SHIFT+N to launch 'Connectivity diag.' extension.

ash/test/test_shell_delegate.cc

Index: ash/test/test_shell_delegate.cc
diff --git a/ash/test/test_shell_delegate.cc b/ash/test/test_shell_delegate.cc
index 07e7c185a0515994a6ebdcc2096061b1fc32b5e9..88bb6d12a5b490980d143827b621deb81afad57e 100644
--- a/ash/test/test_shell_delegate.cc
+++ b/ash/test/test_shell_delegate.cc
@@ -55,6 +55,7 @@ class NewWindowDelegateImpl : public NewWindowDelegate {
   void ShowKeyboardOverlay() override {}
   void ShowTaskManager() override {}
   void OpenFeedbackPage() override {}
+  void OpenNetworkDiag() override {}
 
   DISALLOW_COPY_AND_ASSIGN(NewWindowDelegateImpl);
 };