Remove stops_event_propagation from Window, since it's broken.

ui/aura/client/event_client.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 UI_AURA_CLIENT_EVENT_CLIENT_H_
+#define UI_AURA_CLIENT_EVENT_CLIENT_H_
+#pragma once
+
+#include "ui/aura/aura_export.h"
+#include "ui/aura/window.h"
+
+namespace aura {
+
+class Event;
+class RootWindow;
+
+namespace client {
+
+// An interface implemented by an object that alters event processing.
+class AURA_EXPORT EventClient {
+ public:
+  // Returns true if events can be processed by |window| or any of its children.
+  virtual bool CanProcessEventsWithinSubtree(const Window* window) const = 0;
+
+ protected:
+  virtual ~EventClient() {}
+};
+
+// Sets/Gets the event client on the RootWindow.
+AURA_EXPORT void SetEventClient(RootWindow* root_window, EventClient* client);
+AURA_EXPORT EventClient* GetEventClient(const RootWindow* root_window);
+
+}  // namespace clients
+}  // namespace aura
+
+#endif  // UI_AURA_CLIENT_EVENT_CLIENT_H_