Revert 186187 - crashing on Win XP browser_tests with "Access is denied".

ui/base/win/hwnd_subclass.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 "ui/base/win/hwnd_subclass.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/singleton.h"
-#include "ui/base/win/dpi.h"
 #include "ui/base/win/hwnd_util.h"
 
 namespace {
 const char kHWNDSubclassKey[] = "__UI_BASE_WIN_HWND_SUBCLASS_PROC__";
 
 LRESULT CALLBACK WndProc(HWND hwnd,
                          UINT message,
                          WPARAM w_param,
                          LPARAM l_param) {
   ui::HWNDSubclass* wrapped_wnd_proc =
@@ skipping 90 matching lines @@
   ui::SetWindowProc(target_, &WndProc);
 }
 
 HWNDSubclass::~HWNDSubclass() {
 }
 
 LRESULT HWNDSubclass::OnWndProc(HWND hwnd,
                                 UINT message,
                                 WPARAM w_param,
                                 LPARAM l_param) {
-
-  // Touch messages are always passed in screen coordinates. If the OS is
-  // scaled, but the app is not DPI aware, then then WM_TOUCH might be
-  // intended for a different window.
-  if (message == WM_TOUCH) {
-    TOUCHINPUT point;
-
-    if (GetTouchInputInfo((HTOUCHINPUT)l_param, 1,
-                                     &point, sizeof(TOUCHINPUT))) {
-      POINT touch_location = {
-          TOUCH_COORD_TO_PIXEL(point.x) / ui::win::GetDPIScaleFromRegistry(),
-          TOUCH_COORD_TO_PIXEL(point.y) / ui::win::GetDPIScaleFromRegistry()};
-      HWND actual_target = WindowFromPoint(touch_location);
-      if (actual_target != hwnd) {
-        return SendMessage(actual_target, message, w_param, l_param);
-      }
-    }
-  }
-
   for (std::vector<HWNDMessageFilter*>::iterator it = filters_.begin();
       it != filters_.end(); ++it) {
     LRESULT l_result = 0;
     if ((*it)->FilterMessage(hwnd, message, w_param, l_param, &l_result))
       return l_result;
   }
 
   // In most cases, |original_wnd_proc_| will take care of calling
   // DefWindowProc.
   return CallWindowProc(original_wnd_proc_, hwnd, message, w_param, l_param);
 }
 
 HWNDMessageFilter::~HWNDMessageFilter() {
   HWNDSubclass::RemoveFilterFromAllTargets(this);
 }
 
 }  // namespace ui