Remove more non-aura windows code.

chrome/browser/notifications/balloon.cc

 // Copyright (c) 2012 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/notifications/balloon.h"
 
 #include "base/logging.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/notifications/balloon_collection.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/profiles/profile.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
-#if !defined(OS_WIN) && !defined(USE_AURA)
+#if !defined(USE_AURA)
 // static
 int BalloonView::GetHorizontalMargin() {
   // TODO: implement for linux (non-aura) and mac.
   return 0;
 }
 #endif
 
 Balloon::Balloon(const Notification& notification, Profile* profile,
                  BalloonCollection* collection)
     : profile_(profile),
@@ skipping 55 matching lines @@
   balloon_view_->Close(false);
 }
 
 std::string Balloon::GetExtensionId() {
   const ExtensionService* service = profile()->GetExtensionService();
   const extensions::Extension* extension =
       service->extensions()->GetExtensionOrAppByURL(
           notification().origin_url());
   return extension ? extension->id() : std::string();
 }