clang/win: Let remaining chromium_code targets build with -Wextra.

chrome/browser/ui/views/accessibility/navigation_accessibility_uitest_win.cc

 // Copyright (c) 2015 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 <oleacc.h>
 
 #include "base/strings/string_util.h"
 #include "base/win/scoped_bstr.h"
 #include "base/win/scoped_com_initializer.h"
 #include "base/win/scoped_comptr.h"
@@ skipping 220 matching lines @@
     monitor.WaitForNextEvent(&event, &hwnd, &role, &state, &name);
 
     LOG(INFO) << "Got event: "
               << " event=" << event
               << " hwnd=" << hwnd
               << " role=" << role
               << " state=" << state
               << " name=" << name;
 
     // We should get only focus events.
-    EXPECT_EQ(EVENT_OBJECT_FOCUS, event);
+    EXPECT_EQ(static_cast<DWORD>(EVENT_OBJECT_FOCUS), event);
 
     // We should get only focus events on document objects. (On a page with
     // JavaScript or autofocus, additional focus events would be expected.)
-    EXPECT_EQ(ROLE_SYSTEM_DOCUMENT, role);
+    EXPECT_EQ(static_cast<DWORD>(ROLE_SYSTEM_DOCUMENT), role);
 
     // We shouldn't get any events on the first page because from the time
     // we start monitoring, the user has already initiated a load to the
     // second page.
     EXPECT_NE("First Page", name);
 
     // Finish when we get an event on the second page.
     if (name == "This page is in English") {
       LOG(INFO) << "Got event on second page, finishing test.";
       break;
     }
   }
 }