Rename omaha_client and similar tokens to update_client in all contexts.

components/update_client/update_query_params_delegate.cc

Index: components/update_client/update_query_params_delegate.cc
diff --git a/components/update_client/update_query_params_delegate.cc b/components/update_client/update_query_params_delegate.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e14665adac3724f2916c9fef9eb13067e433823e
--- /dev/null
+++ b/components/update_client/update_query_params_delegate.cc
@@ -0,0 +1,15 @@
+// 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_query_params_delegate.h"
+
+namespace update_client {
+
+UpdateQueryParamsDelegate::UpdateQueryParamsDelegate() {
+}
+
+UpdateQueryParamsDelegate::~UpdateQueryParamsDelegate() {
+}
+
+}  // namespace update_client