Don't check ash accelerators in browser with mash.

chrome/browser/ui/ash/ash_util.cc

Index: chrome/browser/ui/ash/ash_util.cc
diff --git a/chrome/browser/ui/ash/ash_util.cc b/chrome/browser/ui/ash/ash_util.cc
index 6f3f395a6044e32cc9c8c8b82156e31de290620f..ee36f53dc6b65b74221460487ccc1f3d0303cf1c 100644
--- a/chrome/browser/ui/ash/ash_util.cc
+++ b/chrome/browser/ui/ash/ash_util.cc
@@ -59,6 +59,10 @@ bool IsNativeWindowInAsh(gfx::NativeWindow native_window) {
 }
 
 bool IsAcceleratorDeprecated(const ui::Accelerator& accelerator) {
+  // When running in mash the browser doesn't handle ash accelerators.
+  if (chrome::IsRunningInMash())
+    return false;
+
   ash::AcceleratorController* controller =
       ash::Shell::GetInstance()->accelerator_controller();
   return controller->IsDeprecated(accelerator);