[Extensions] Fix a data race in ChromeExtensionMessageFilter.

extensions/browser/info_map.cc

 // Copyright 2013 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/browser/info_map.h"
 
 #include "base/strings/string_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "extensions/browser/content_verifier.h"
 #include "extensions/common/constants.h"
@@ skipping 31 matching lines @@
 
 InfoMap::ExtraData::ExtraData()
     : incognito_enabled(false), notifications_disabled(false) {
 }
 
 InfoMap::ExtraData::~ExtraData() {}
 
 InfoMap::InfoMap() {
 }
 
+const ExtensionSet& InfoMap::extensions() const {
+  CheckOnValidThread();
+  return extensions_;
+}
+
+const ExtensionSet& InfoMap::disabled_extensions() const {
+  CheckOnValidThread();
+  return disabled_extensions_;
+}
+
 void InfoMap::AddExtension(const Extension* extension,
                            base::Time install_time,
                            bool incognito_enabled,
                            bool notifications_disabled) {
   CheckOnValidThread();
   extensions_.Insert(extension);
   disabled_extensions_.Remove(extension->id());
 
   extra_data_[extension->id()].install_time = install_time;
   extra_data_[extension->id()].incognito_enabled = incognito_enabled;
@@ skipping 175 matching lines @@
 }
 
 InfoMap::~InfoMap() {
   if (quota_service_) {
     BrowserThread::DeleteSoon(
         BrowserThread::IO, FROM_HERE, quota_service_.release());
   }
 }
 
 }  // namespace extensions