Explicitly coerce PostDispatchAction to uint32_t in DispatchEvent()

ui/wm/core/nested_accelerator_controller_unittest.cc

Index: ui/wm/core/nested_accelerator_controller_unittest.cc
diff --git a/ui/wm/core/nested_accelerator_controller_unittest.cc b/ui/wm/core/nested_accelerator_controller_unittest.cc
index ce548d56829ee5dcb0996fa0b240ca645d0d2a4e..63a73c6d4968ca42c925bf61feca6d9b283a91b2 100644
--- a/ui/wm/core/nested_accelerator_controller_unittest.cc
+++ b/ui/wm/core/nested_accelerator_controller_unittest.cc
@@ -46,7 +46,7 @@ class MockDispatcher : public ui::PlatformEventDispatcher {
   virtual uint32_t DispatchEvent(const ui::PlatformEvent& event) override {
     if (ui::EventTypeFromNative(event) == ui::ET_KEY_RELEASED)
       num_key_events_dispatched_++;
-    return ui::POST_DISPATCH_NONE;
+    return ui::kPostDispatchNone;
   }
 
   int num_key_events_dispatched_;