Don't dispatch window focus change events to other profiles.

chrome/browser/extensions/window_event_router.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 "chrome/browser/extensions/window_event_router.h"
 
 #include "base/json/json_writer.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/event_names.h"
 #include "chrome/browser/extensions/event_router.h"
@@ skipping 134 matching lines @@
   if (focused_profile_ != NULL && previous_focused_profile != NULL &&
       focused_profile_ != previous_focused_profile) {
     ListValue none_args;
     none_args.Append(
         Value::CreateIntegerValue(extension_misc::kUnknownWindowId));
     base::JSONWriter::Write(&none_args, &none_json_args);
   }
 
   if (!window_profile)
     window_profile = previous_focused_profile;
+  if (!profile_->IsSameProfile(window_profile) ||
+      !ExtensionSystem::Get(window_profile)->event_router()) {
+    return;
+  }
 
   ExtensionSystem::Get(window_profile)->event_router()->
       DispatchEventsToRenderersAcrossIncognito(
           event_names::kOnWindowFocusedChanged,
           real_json_args,
           window_profile,
           none_json_args,
           GURL());
 }
 
 void WindowEventRouter::DispatchEvent(const char* event_name,
                                       Profile* profile,
                                       base::ListValue* args) {
   std::string json_args;
   base::JSONWriter::Write(args, &json_args);
   ExtensionSystem::Get(profile)->event_router()->
       DispatchEventToRenderers(event_name, json_args, profile, GURL());
 }
 
 }  // namespace extensions