Remove stops_event_propagation from Window, since it's broken.

ash/wm/event_client_impl.h

+// 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.
+
+#ifndef ASH_WM_EVENT_CLIENT_IMPL_H_
+#define ASH_WM_EVENT_CLIENT_IMPL_H_
+#pragma once
+
+#include "ash/ash_export.h"
+#include "ui/aura/client/event_client.h"
+
+namespace aura {
+class RootWindow;
+}
+
+namespace ash {
+namespace internal {
+
+class EventClientImpl : public aura::client::EventClient {
+ public:
+  explicit EventClientImpl(aura::RootWindow* root_window);
+  virtual ~EventClientImpl();
+
+ private:
+  // Overridden from aura::client::EventClient:
+  virtual bool CanProcessEventsWithinSubtree(
+      const aura::Window* window) const OVERRIDE;
+
+  aura::RootWindow* root_window_;
+
+  DISALLOW_COPY_AND_ASSIGN(EventClientImpl);
+};
+
+}  // namespace internal
+}  // namespace ash
+
+#endif  // ASH_WM_EVENT_CLIENT_IMPL_H_