Add method for identifying different InfoBars

chrome/browser/android/download/android_download_manager_overwrite_infobar_delegate.h

 // Copyright 2015 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_ANDROID_DOWNLOAD_ANDROID_DOWNLOAD_MANAGER_OVERWRITE_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_ANDROID_DOWNLOAD_ANDROID_DOWNLOAD_MANAGER_OVERWRITE_INFOBAR_DELEGATE_H_
 
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/callback.h"
@@ skipping 21 matching lines @@
 
  private:
   AndroidDownloadManagerOverwriteInfoBarDelegate(
       const std::string& file_name,
       const std::string& dir_name,
       const std::string& dir_full_path,
       jobject chrome_download_delegate,
       jobject download_info);
 
   // DownloadOverwriteInfoBarDelegate:
+  std::string GetIdentifier() const override;
   bool OverwriteExistingFile() override;
   bool CreateNewFile() override;
   std::string GetFileName() const override;
   std::string GetDirName() const override;
   std::string GetDirFullPath() const override;
 
   std::string file_name_;
   std::string dir_name_;
   std::string dir_full_path_;
   base::android::ScopedJavaGlobalRef<jobject> chrome_download_delegate_;
   base::android::ScopedJavaGlobalRef<jobject> download_info_;
 
   DISALLOW_COPY_AND_ASSIGN(AndroidDownloadManagerOverwriteInfoBarDelegate);
 };
 
 }  // namespace android
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_ANDROID_DOWNLOAD_ANDROID_DOWNLOAD_MANAGER_OVERWRITE_INFOBAR_DELEGATE_H_