Explicitly coerce PostDispatchAction to uint32_t in DispatchEvent()

ui/wm/core/nested_accelerator_dispatcher_linux.cc

Index: ui/wm/core/nested_accelerator_dispatcher_linux.cc
diff --git a/ui/wm/core/nested_accelerator_dispatcher_linux.cc b/ui/wm/core/nested_accelerator_dispatcher_linux.cc
index ee5b587225cf6149e8bbe5b0301a911240102e4e..e2ac376f39337529c327d236bf6898aeb8d5b539 100644
--- a/ui/wm/core/nested_accelerator_dispatcher_linux.cc
+++ b/ui/wm/core/nested_accelerator_dispatcher_linux.cc
@@ -64,7 +64,8 @@ class NestedAcceleratorDispatcherLinux : public NestedAcceleratorDispatcher,
     return true;
   }
 
-  virtual uint32_t DispatchEvent(const ui::PlatformEvent& event) override {
+  virtual ui::PostDispatchAction DispatchEvent(
+      const ui::PlatformEvent& event) override {
     if (IsKeyEvent(event)) {
       ui::KeyEvent key_event(event);
       ui::Accelerator accelerator = CreateAcceleratorFromKeyEvent(key_event);
@@ -76,17 +77,16 @@ class NestedAcceleratorDispatcherLinux : public NestedAcceleratorDispatcher,
 #else
           NOTIMPLEMENTED();
 #endif
-          return ui::POST_DISPATCH_NONE;
+          return ui::kPostDispatchNone;
         case NestedAcceleratorDelegate::RESULT_PROCESSED:
-          return ui::POST_DISPATCH_NONE;
+          return ui::kPostDispatchNone;
         case NestedAcceleratorDelegate::RESULT_NOT_PROCESSED:
           break;
       }
     }
     ui::PlatformEventDispatcher* prev = *restore_dispatcher_;
 
-    return prev ? prev->DispatchEvent(event)
-                : ui::POST_DISPATCH_PERFORM_DEFAULT;
+    return prev ? prev->DispatchEvent(event) : ui::kPostDispatchPerformDefault;
   }
 
   scoped_ptr<ui::ScopedEventDispatcher> restore_dispatcher_;