Remove unused DataReductionProxyInfoBar and related code

chrome/browser/ui/android/infobars/data_reduction_proxy_infobar.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_UI_ANDROID_INFOBARS_DATA_REDUCTION_PROXY_INFOBAR_H_
-#define CHROME_BROWSER_UI_ANDROID_INFOBARS_DATA_REDUCTION_PROXY_INFOBAR_H_
-
-#include "base/macros.h"
-#include "base/strings/string16.h"
-#include "chrome/browser/net/spdyproxy/data_reduction_proxy_infobar_delegate_android.h"
-#include "chrome/browser/ui/android/infobars/confirm_infobar.h"
-
-class DataReductionProxyInfoBar : public ConfirmInfoBar {
- public:
-  static void Launch(JNIEnv* env,
-                     jclass,
-                     jobject jweb_contents,
-                     jstring jlink_url);
-
-  static bool Register(JNIEnv* env);
-
-  explicit DataReductionProxyInfoBar(
-      std::unique_ptr<DataReductionProxyInfoBarDelegateAndroid> delegate);
-
-  ~DataReductionProxyInfoBar() override;
-
- private:
-  // ConfirmInfoBar:
-  base::android::ScopedJavaLocalRef<jobject> CreateRenderInfoBar(
-      JNIEnv* env) override;
-
-  DataReductionProxyInfoBarDelegateAndroid* GetDelegate();
-
-  base::android::ScopedJavaGlobalRef<jobject>
-  java_data_reduction_proxy_delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(DataReductionProxyInfoBar);
-};
-
-bool RegisterDataReductionProxyInfoBar(JNIEnv* env);
-
-#endif  // CHROME_BROWSER_UI_ANDROID_INFOBARS_DATA_REDUCTION_PROXY_INFOBAR_H_