Rename omaha_client and similar tokens to update_client in all contexts.

chrome/browser/omaha_client/chrome_omaha_query_params_delegate.h

-// 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.
-
-#ifndef CHROME_BROWSER_OMAHA_CLIENT_CHROME_OMAHA_QUERY_PARAMS_DELEGATE_H_
-#define CHROME_BROWSER_OMAHA_CLIENT_CHROME_OMAHA_QUERY_PARAMS_DELEGATE_H_
-
-#include "components/omaha_client/omaha_query_params_delegate.h"
-
-class ChromeOmahaQueryParamsDelegate
-    : public omaha_client::OmahaQueryParamsDelegate {
- public:
-  ChromeOmahaQueryParamsDelegate();
-  ~ChromeOmahaQueryParamsDelegate() override;
-
-  // Gets the LazyInstance for ChromeOmahaQueryParamsDelegate.
-  static ChromeOmahaQueryParamsDelegate* GetInstance();
-
-  // omaha_client::OmahaQueryParamsDelegate:
-  std::string GetExtraParams() override;
-
-  // Returns the value we use for the "updaterchannel=" and "prodchannel="
-  // parameters. Possible return values include: "canary", "dev", "beta", and
-  // "stable".
-  static const char* GetChannelString();
-
-  // Returns the language for the present locale. Possible return values are
-  // standard tags for languages, such as "en", "en-US", "de", "fr", "af", etc.
-  static const char* GetLang();
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ChromeOmahaQueryParamsDelegate);
-};
-
-#endif  // CHROME_BROWSER_OMAHA_CLIENT_CHROME_OMAHA_QUERY_PARAMS_DELEGATE_H_