Add extensions code to use common updater in components/update_client/

chrome/browser/extensions/chrome_extensions_browser_client.cc

Index: chrome/browser/extensions/chrome_extensions_browser_client.cc
diff --git a/chrome/browser/extensions/chrome_extensions_browser_client.cc b/chrome/browser/extensions/chrome_extensions_browser_client.cc
index e2dce0376c3afe85a1253b8159b0fe9f6f3dd9f5..0627a56af46c13766e01dfc782ecebd8a37b5cec 100644
--- a/chrome/browser/extensions/chrome_extensions_browser_client.cc
+++ b/chrome/browser/extensions/chrome_extensions_browser_client.cc
@@ -26,6 +26,7 @@
 #include "chrome/browser/extensions/extension_system_factory.h"
 #include "chrome/browser/extensions/extension_util.h"
 #include "chrome/browser/extensions/menu_manager.h"
+#include "chrome/browser/extensions/updater/chrome_update_client_config.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ -36,6 +37,7 @@
 #include "chrome/common/extensions/features/feature_channel.h"
 #include "chrome/common/pref_names.h"
 #include "components/net_log/chrome_net_log.h"
+#include "components/update_client/update_client.h"
 #include "components/version_info/version_info.h"
 #include "content/public/browser/render_process_host.h"
 #include "extensions/browser/api/generated_api_registration.h"
@@ -370,4 +372,11 @@ void ChromeExtensionsBrowserClient::AttachExtensionTaskManagerTag(
   }
 }
 
+scoped_refptr<update_client::UpdateClient>
+ChromeExtensionsBrowserClient::CreateUpdateClient(
+    content::BrowserContext* context) {
+  return update_client::UpdateClientFactory(
+      make_scoped_refptr(new ChromeUpdateClientConfig(context)));
+}
+
 }  // namespace extensions