Move most of the component updater artifacts to update_client.

components/update_client/crx_downloader.h

Index: components/update_client/crx_downloader.h
diff --git a/components/component_updater/crx_downloader.h b/components/update_client/crx_downloader.h
similarity index 95%
rename from components/component_updater/crx_downloader.h
rename to components/update_client/crx_downloader.h
index 4a421f2dd2a8d4ed6c14df3e261406167dfc0094..661b5c846241ed9fec7a0cc49c8576c90407f94f 100644
--- a/components/component_updater/crx_downloader.h
+++ b/components/update_client/crx_downloader.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_COMPONENT_UPDATER_CRX_DOWNLOADER_H_
-#define COMPONENTS_COMPONENT_UPDATER_CRX_DOWNLOADER_H_
+#ifndef COMPONENTS_UPDATE_CLIENT_CRX_DOWNLOADER_H_
+#define COMPONENTS_UPDATE_CLIENT_CRX_DOWNLOADER_H_
 
 #include <stdint.h>
 #include <vector>
@@ -25,7 +25,7 @@ namespace net {
 class URLRequestContextGetter;
 }
 
-namespace component_updater {
+namespace update_client {
 
 // Defines a download interface for downloading components, with retrying on
 // fallback urls in case of errors. This class implements a chain of
@@ -151,6 +151,6 @@ class CrxDownloader {
   DISALLOW_COPY_AND_ASSIGN(CrxDownloader);
 };
 
-}  // namespace component_updater
+}  // namespace update_client
 
-#endif  // COMPONENTS_COMPONENT_UPDATER_CRX_DOWNLOADER_H_
+#endif  // COMPONENTS_UPDATE_CLIENT_CRX_DOWNLOADER_H_