Explicitly coerce PostDispatchAction to uint32_t in DispatchEvent()

ui/wm/core/nested_accelerator_dispatcher_linux.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/wm/core/nested_accelerator_dispatcher.h"
 
 #include "base/memory/scoped_ptr.h"
 #include "base/run_loop.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/events/event.h"
@@ skipping 67 matching lines @@
 #endif
           return ui::POST_DISPATCH_NONE;
         case NestedAcceleratorDelegate::RESULT_PROCESSED:
           return ui::POST_DISPATCH_NONE;
         case NestedAcceleratorDelegate::RESULT_NOT_PROCESSED:
           break;
       }
     }
     ui::PlatformEventDispatcher* prev = *restore_dispatcher_;
 
-    return prev ? prev->DispatchEvent(event)
-                : ui::POST_DISPATCH_PERFORM_DEFAULT;
+    uint32_t perform_default = ui::POST_DISPATCH_PERFORM_DEFAULT;
+    return prev ? prev->DispatchEvent(event) : perform_default;
   }
 
   scoped_ptr<ui::ScopedEventDispatcher> restore_dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(NestedAcceleratorDispatcherLinux);
 };
 
 scoped_ptr<NestedAcceleratorDispatcher> NestedAcceleratorDispatcher::Create(
     NestedAcceleratorDelegate* delegate,
     base::MessagePumpDispatcher* nested_dispatcher) {
   return scoped_ptr<NestedAcceleratorDispatcher>(
       new NestedAcceleratorDispatcherLinux(delegate));
 }
 
 }  // namespace wm