Enable MSVC warning for unused locals.

chrome/browser/extensions/api/extension_action/browser_action_interactive_test.cc

 // Copyright 2013 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 "chrome/browser/extensions/browser_action_test_util.h"
 #include "chrome/browser/extensions/extension_action.h"
 #include "chrome/browser/extensions/extension_action_manager.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
@@ skipping 318 matching lines @@
   OpenExtensionPopupViaAPI();
   BrowserActionTestUtil test_util(browser());
   const gfx::NativeView view = test_util.GetPopupNativeView();
   EXPECT_NE(static_cast<gfx::NativeView>(NULL), view);
   const HWND hwnd = views::HWNDForNativeView(view);
   EXPECT_EQ(hwnd,
             views::HWNDForNativeView(browser()->window()->GetNativeWindow()));
   EXPECT_EQ(TRUE, ::IsWindow(hwnd));
 
   // Create a new browser window to prevent the message loop from terminating.
-  Browser* new_browser = chrome::FindBrowserWithWebContents(
-      browser()->OpenURL(content::OpenURLParams(
-          GURL("about:"), content::Referrer(), NEW_WINDOW,
-          ui::PAGE_TRANSITION_TYPED, false)));
+  browser()->OpenURL(content::OpenURLParams(GURL("about:"), content::Referrer(),
+                                            NEW_WINDOW,
+                                            ui::PAGE_TRANSITION_TYPED, false));
 
   // Forcibly closing the browser HWND should not cause a crash.
   EXPECT_EQ(TRUE, ::CloseWindow(hwnd));
   EXPECT_EQ(TRUE, ::DestroyWindow(hwnd));
   EXPECT_EQ(FALSE, ::IsWindow(hwnd));
 }
 #endif  // OS_WIN
 
 }  // namespace
 }  // namespace extensions