Support "Report Issue" in case of no-browser windows in ChromeOS.

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index bc3f30d6a9a6f5e8ae66c6773cd1d768ebdc79ef..9accbd67eb031749afa64b4927b9dea1e0c127d2 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -124,9 +124,13 @@ ash::SystemTrayDelegate* ShellDelegateImpl::CreateSystemTrayDelegate(
 ash::UserWallpaperDelegate* ShellDelegateImpl::CreateUserWallpaperDelegate() {
   return NULL;
 }
+
 aura::client::UserActionClient* ShellDelegateImpl::CreateUserActionClient() {
   return NULL;
 }
 
+void ShellDelegateImpl::OpenFeedbackPage() {
+}
+
 }  // namespace shell
 }  // namespace ash