Move most of the component updater artifacts to update_client.

components/update_client/update_client.cc

Index: components/update_client/update_client.cc
diff --git a/components/update_client/update_client.cc b/components/update_client/update_client.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b7fff2b5384b8395b16d3efe699935dcb3f2b6fd
--- /dev/null
+++ b/components/update_client/update_client.cc
@@ -0,0 +1,33 @@
+// 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 "components/update_client/crx_update_item.h"
+
+namespace update_client {
+
+CrxUpdateItem::CrxUpdateItem()
+    : status(kNew),
+      on_demand(false),
+      diff_update_failed(false),
+      error_category(0),
+      error_code(0),
+      extra_code1(0),
+      diff_error_category(0),
+      diff_error_code(0),
+      diff_extra_code1(0) {
+}
+
+CrxUpdateItem::~CrxUpdateItem() {
+}
+
+CrxComponent::CrxComponent()
+    : installer(NULL), allow_background_download(true) {
+}
+
+CrxComponent::~CrxComponent() {
+}
+
+}  // namespace update_client