Fix cause of uninitialized memory read in ExtensionService unit_tests

chrome/browser/extensions/extension_sync_data.cc

 // Copyright (c) 2011 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/extension_sync_data.h"
 
 #include "base/logging.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/sync/protocol/app_specifics.pb.h"
 #include "chrome/browser/sync/protocol/extension_specifics.pb.h"
 
 ExtensionSyncData::ExtensionSyncData()
     : uninstalled_(false),
       enabled_(false),
       incognito_enabled_(false),
       type_(Extension::SYNC_TYPE_NONE),
       notifications_disabled_(false) {
 }
 
 ExtensionSyncData::ExtensionSyncData(const SyncData& sync_data)
     : uninstalled_(false),
       enabled_(false),
       incognito_enabled_(false),
       type_(Extension::SYNC_TYPE_NONE),
       notifications_disabled_(false) {
   PopulateFromSyncData(sync_data);
 }
 
 ExtensionSyncData::ExtensionSyncData(const SyncChange& sync_change)
-    : uninstalled_(sync_change.change_type() == SyncChange::ACTION_DELETE) {
+    : uninstalled_(sync_change.change_type() == SyncChange::ACTION_DELETE),
+      enabled_(false),
+      incognito_enabled_(false),
+      type_(Extension::SYNC_TYPE_NONE),
+      notifications_disabled_(false) {
   PopulateFromSyncData(sync_change.sync_data());
 }
 
 ExtensionSyncData::ExtensionSyncData(const Extension& extension,
                                      bool enabled,
                                      bool incognito_enabled,
                                      const std::string& notifications_client_id,
                                      bool notifications_disabled)
   : id_(extension.id()),
     uninstalled_(false),
@@ skipping 96 matching lines @@
 
     notifications_disabled_ =
         app_specifics.has_notification_settings() &&
         app_specifics.notification_settings().has_disabled() &&
         app_specifics.notification_settings().disabled();
   } else {
     LOG(FATAL) << "Attempt to sync bad EntitySpecifics.";
   }
   PopulateFromExtensionSpecifics(extension_expecifics);
 }