Allow fallback from https to http for component update checks.

chrome/browser/component_updater/ev_whitelist_component_installer.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 "chrome/browser/component_updater/ev_whitelist_component_installer.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 57 matching lines @@
     0xe0, 0x53, 0x15, 0x2e, 0x73, 0x29, 0x0d, 0x32, 0x4d, 0xc2, 0x25,
     0xef, 0x14, 0xab, 0xd8, 0x2f, 0x84, 0xf5, 0x85, 0x9e, 0xc0, 0xfa,
     0x94, 0xbc, 0x99, 0xc9, 0x5a, 0x27, 0x55, 0x19, 0x83, 0xef};
 
 const char kEVWhitelistManifestName[] = "EV Certs CT whitelist";
 
 bool EVWhitelistComponentInstallerTraits::CanAutoUpdate() const {
   return true;
 }
 
+bool EVWhitelistComponentInstallerTraits::RequiresNetworkEncryption() const {
+  return false;
+}
+
 bool EVWhitelistComponentInstallerTraits::OnCustomInstall(
     const base::DictionaryValue& manifest,
     const base::FilePath& install_dir) {
   VLOG(1) << "Entering EVWhitelistComponentInstallerTraits::OnCustomInstall.";
 
   return true;  // Nothing custom here.
 }
 
 base::FilePath EVWhitelistComponentInstallerTraits::GetInstalledPath(
     const base::FilePath& base) {
@@ skipping 50 matching lines @@
   DefaultComponentInstaller* installer =
       new DefaultComponentInstaller(std::move(traits));
   installer->Register(cus, base::Closure());
 
   content::BrowserThread::PostAfterStartupTask(
       FROM_HERE, content::BrowserThread::GetBlockingPool(),
       base::Bind(&DeleteWhitelistCopy, user_data_dir));
 }
 
 }  // namespace component_updater