Remove unused DataReductionProxyInfoBar and related code

chrome/browser/net/spdyproxy/data_reduction_proxy_infobar_delegate_android.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_NET_SPDYPROXY_DATA_REDUCTION_PROXY_INFOBAR_DELEGATE_ANDROID_H_
-#define CHROME_BROWSER_NET_SPDYPROXY_DATA_REDUCTION_PROXY_INFOBAR_DELEGATE_ANDROID_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "components/infobars/core/confirm_infobar_delegate.h"
-#include "components/infobars/core/infobar_delegate.h"
-
-namespace content {
-class WebContents;
-}
-
-namespace infobars {
-class InfoBarManager;
-}
-
-// Configures an InfoBar with no buttons that stays visible until it is
-// explicitly dismissed. This InfoBar is suitable for displaying a message
-// and a link, and is used only by an Android field trial.
-class DataReductionProxyInfoBarDelegateAndroid : public ConfirmInfoBarDelegate {
- public:
-  // Creates the InfoBar and adds it to the provided |web_contents|.
-  static void Create(content::WebContents* web_contents,
-                     const std::string& link_url);
-
-  ~DataReductionProxyInfoBarDelegateAndroid() override;
-
- private:
-  explicit DataReductionProxyInfoBarDelegateAndroid(
-      const std::string& link_url);
-
-  // Returns a Data Reduction Proxy infobar that owns |delegate|.
-  static std::unique_ptr<infobars::InfoBar> CreateInfoBar(
-      infobars::InfoBarManager* infobar_manager,
-      std::unique_ptr<DataReductionProxyInfoBarDelegateAndroid> delegate);
-
-  // ConfirmInfoBarDelegate
-  infobars::InfoBarDelegate::InfoBarIdentifier GetIdentifier() const override;
-  bool ShouldExpire(const NavigationDetails& details) const override;
-  base::string16 GetMessageText() const override;
-  int GetButtons() const override;
-  GURL GetLinkURL() const override;
-  bool LinkClicked(WindowOpenDisposition disposition) override;
-
-  std::string link_url_;
-
-  DISALLOW_COPY_AND_ASSIGN(DataReductionProxyInfoBarDelegateAndroid);
-};
-
-#endif  // CHROME_BROWSER_NET_SPDYPROXY_DATA_REDUCTION_PROXY_INFOBAR_DELEGATE_ANDROID_H_