Let Chrome app handle Ash accelerators first if the app is launched as a window

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 c2bfdc081c882099a1d08c74baef54d6770c70ad..daae95470b955e98983814db420e49d9a969b8f7 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -63,6 +63,10 @@ void ShellDelegateImpl::NewWindow(bool incognito) {
   ash::shell::ToplevelWindow::CreateToplevelWindow(create_params);
 }
 
+bool ShellDelegateImpl::IsBrowserWindow(const aura::Window* window) {
+  return false;
+}
+
 void ShellDelegateImpl::Search() {
 }