Enable MSVC warning for unused locals.

ui/wm/core/nested_accelerator_controller_unittest.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_controller.h"
 
 #include "base/bind.h"
 #include "base/event_types.h"
 #include "base/message_loop/message_loop.h"
 #include "ui/aura/test/aura_test_base.h"
@@ skipping 65 matching lines @@
 };
 
 void DispatchKeyReleaseA(aura::Window* root_window) {
 // Sending both keydown and keyup is necessary here because the accelerator
 // manager only checks a keyup event following a keydown event. See
 // ShouldHandle() in ui/base/accelerators/accelerator_manager.cc for details.
 #if defined(OS_WIN)
   aura::WindowTreeHost* host = root_window->GetHost();
   HWND hwnd = host->GetAcceleratedWidget();
   ::PostMessage(hwnd, WM_KEYDOWN, ui::VKEY_A, 0);
-  MSG native_event_up = {NULL, WM_KEYUP, ui::VKEY_A, 0};
   ::PostMessage(hwnd, WM_KEYUP, ui::VKEY_A, 0);
 #elif defined(USE_X11)
   ui::ScopedXI2Event native_event;
   native_event.InitKeyEvent(ui::ET_KEY_PRESSED, ui::VKEY_A, 0);
   aura::WindowTreeHost* host = root_window->GetHost();
   aura::test::PostEventToWindowTreeHost(*native_event, host);
   native_event.InitKeyEvent(ui::ET_KEY_RELEASED, ui::VKEY_A, 0);
   aura::test::PostEventToWindowTreeHost(*native_event, host);
 #endif
   // Make sure the inner message-loop terminates after dispatching the events.
@@ skipping 101 matching lines @@
           &inner_dispatcher);
   aura::client::DispatcherRunLoop run_loop(
       aura::client::GetDispatcherClient(root_window()), NULL);
   run_loop.Run();
   EXPECT_EQ(0, inner_dispatcher.num_key_events_dispatched());
   EXPECT_EQ(1, target.accelerator_pressed_count());
 }
 
 }  //  namespace test
 }  //  namespace wm