Add method for identifying different InfoBars

chrome/browser/android/download/chrome_download_manager_overwrite_infobar_delegate.cc

 // 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.
 
 #include "chrome/browser/android/download/chrome_download_manager_overwrite_infobar_delegate.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/files/file_util.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 23 matching lines @@
 
 ChromeDownloadManagerOverwriteInfoBarDelegate::
     ChromeDownloadManagerOverwriteInfoBarDelegate(
         const base::FilePath& suggested_download_path,
         const DownloadTargetDeterminerDelegate::FileSelectedCallback&
             file_selected_callback)
     : suggested_download_path_(suggested_download_path),
       file_selected_callback_(file_selected_callback) {
 }
 
+std::string
+ChromeDownloadManagerOverwriteInfoBarDelegate::GetIdentifier() const {
+  return "ChromeDownloadManagerOverwriteInfoBarDelegate";
+}
+
 bool ChromeDownloadManagerOverwriteInfoBarDelegate::OverwriteExistingFile() {
   file_selected_callback_.Run(suggested_download_path_);
   return true;
 }
 
 bool ChromeDownloadManagerOverwriteInfoBarDelegate::CreateNewFile() {
   content::BrowserThread::PostTask(
       content::BrowserThread::FILE, FROM_HERE,
       base::Bind(
           &ChromeDownloadManagerOverwriteInfoBarDelegate::CreateNewFileInternal,
@@ skipping 28 matching lines @@
   if (uniquifier > 0) {
     new_path = suggested_download_path.InsertBeforeExtensionASCII(
         base::StringPrintf(" (%d)", uniquifier));
   }
   content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
                                    base::Bind(callback, new_path));
 }
 
 }  // namespace android
 }  // namespace chrome