Use precompiled headers for most large projects.

content/browser/renderer_host/render_widget_host_view_win.cc

 // 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.
 
-// Need Win 7 headers for WM_GESTURE and ChangeWindowMessageFilterEx
+// Need a few defines from Win 7 headers for WM_GESTURE and
+// ChangeWindowMessageFilterEx.
 // TODO(jschuh): See crbug.com/92941 for longterm fix.
-#undef  WINVER
-#define WINVER _WIN32_WINNT_WIN7
-#undef  _WIN32_WINNT
-#define _WIN32_WINNT _WIN32_WINNT_WIN7
 #include <windows.h>
+#if(WINVER < 0x0601)
+typedef struct tagCHANGEFILTERSTRUCT {
+  DWORD cbSize;
+  DWORD ExtStatus;
+} CHANGEFILTERSTRUCT, *PCHANGEFILTERSTRUCT;
+#define MSGFLT_ALLOW (1)
+#define WM_GESTURE 0x0119
+#endif  // WINVER < 0x0601
 
 #include "content/browser/renderer_host/render_widget_host_view_win.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #include "base/i18n/rtl.h"
 #include "base/metrics/histogram.h"
 #include "base/process_util.h"
 #include "base/threading/thread.h"
@@ skipping 1814 matching lines @@
                                                       DWORD ex_style) {
   parent_hwnd_ = parent_hwnd;
   Create(parent_hwnd_, NULL, NULL, WS_POPUP, ex_style);
   MoveWindow(pos.x(), pos.y(), pos.width(), pos.height(), TRUE);
   // To show tooltip on popup window.(e.g. title in <select>)
   // Popups default to showing, which means |DidBecomeSelected()| isn't invoked.
   // Ensure the tooltip is created otherwise tooltips are never shown.
   EnsureTooltip();
   ShowWindow(IsActivatable() ? SW_SHOW : SW_SHOWNA);
 }