Revert of Fix for menus blocking user activity detection (Retry).

extensions/shell/browser/shell_desktop_controller_aura.cc

 // Copyright 2014 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 "extensions/shell/browser/shell_desktop_controller_aura.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 261 matching lines @@
 
   cursor_manager_.reset(
       new wm::CursorManager(scoped_ptr<wm::NativeCursorManager>(
           new ShellNativeCursorManager(host_.get()))));
   cursor_manager_->SetDisplay(
       gfx::Screen::GetNativeScreen()->GetPrimaryDisplay());
   cursor_manager_->SetCursor(ui::kCursorPointer);
   aura::client::SetCursorClient(host_->window(), cursor_manager_.get());
 
   user_activity_detector_.reset(new ui::UserActivityDetector);
+  host_->event_processor()->GetRootTarget()->AddPreTargetHandler(
+      user_activity_detector_.get());
 #if defined(OS_CHROMEOS)
   user_activity_notifier_.reset(
       new ui::UserActivityPowerManagerNotifier(user_activity_detector_.get()));
 #endif
 }
 
 void ShellDesktopControllerAura::CreateRootWindow() {
   // Set up basic pieces of ui::wm.
   gfx::Size size;
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
@@ skipping 23 matching lines @@
   host_->AddObserver(this);
 
   // Ensure the X window gets mapped.
   host_->Show();
 }
 
 void ShellDesktopControllerAura::DestroyRootWindow() {
   host_->RemoveObserver(this);
   if (input_method_filter_)
     root_window_event_filter_->RemoveHandler(input_method_filter_.get());
+  if (user_activity_detector_) {
+    host_->event_processor()->GetRootTarget()->RemovePreTargetHandler(
+        user_activity_detector_.get());
+  }
   wm::FocusController* focus_controller =
       static_cast<wm::FocusController*>(focus_client_.get());
   if (focus_controller) {
     host_->window()->RemovePreTargetHandler(focus_controller);
     aura::client::SetActivationClient(host_->window(), NULL);
   }
   root_window_event_filter_.reset();
   capture_client_.reset();
   input_method_filter_.reset();
   focus_client_.reset();
@@ skipping 13 matching lines @@
   if (displays.empty())
     return gfx::Size();
   const ui::DisplayMode* mode = displays[0].display->current_mode();
   return mode ? mode->size() : gfx::Size();
 #else
   return gfx::Size();
 #endif
 }
 
 }  // namespace extensions