Allow fallback from https to http for component update checks.

components/update_client/update_client.cc

 // Copyright 2014 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 "components/update_client/update_client.h"
 
 #include <algorithm>
 #include <queue>
 #include <set>
 #include <utility>
@@ skipping 34 matching lines @@
       diff_error_category(0),
       diff_error_code(0),
       diff_extra_code1(0) {
 }
 
 CrxUpdateItem::CrxUpdateItem(const CrxUpdateItem& other) = default;
 
 CrxUpdateItem::~CrxUpdateItem() {
 }
 
-CrxComponent::CrxComponent() : allow_background_download(true) {
-}
+CrxComponent::CrxComponent()
+    : allows_background_download(true), requires_network_encryption(true) {}
 
 CrxComponent::CrxComponent(const CrxComponent& other) = default;
 
 CrxComponent::~CrxComponent() {
 }
 
 // It is important that an instance of the UpdateClient binds an unretained
 // pointer to itself. Otherwise, a life time circular dependency between this
 // instance and its inner members prevents the destruction of this instance.
 // Using unretained references is allowed in this case since the life time of
@@ skipping 180 matching lines @@
 }
 
 scoped_refptr<UpdateClient> UpdateClientFactory(
     const scoped_refptr<Configurator>& config) {
   scoped_ptr<PingManager> ping_manager(new PingManager(config));
   return new UpdateClientImpl(config, std::move(ping_manager),
                               &UpdateChecker::Create, &CrxDownloader::Create);
 }
 
 }  // namespace update_client