content: Make ifdefs match with where this is used

content/browser/renderer_host/gtk_window_utils.h

+// Copyright (c) 2011 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.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_GTK_WINDOW_UTILS_H_
+#define CONTENT_BROWSER_RENDERER_HOST_GTK_WINDOW_UTILS_H_
+#pragma once
+
+typedef struct _GdkDrawable GdkWindow;
+
+namespace WebKit {
+struct WebScreenInfo;
+}
+
+namespace content {
+
+void GetScreenInfoFromNativeWindow(
+    GdkWindow* gdk_window, WebKit::WebScreenInfo* results);
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_GTK_WINDOW_UTILS_H_