Remove the unused parts of PPB_PDF

chrome/browser/ui/pdf/chrome_pdf_web_contents_helper_client.cc

 // 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.
 
 #include "chrome/browser/ui/pdf/chrome_pdf_web_contents_helper_client.h"
 
 #include "chrome/browser/download/download_stats.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_window.h"
@@ skipping 52 matching lines @@
 
 void ChromePDFWebContentsHelperClient::OnPDFHasUnsupportedFeature(
     content::WebContents* contents) {
   PDFHasUnsupportedFeature(GetWebContentsToUse(contents));
 }
 
 void ChromePDFWebContentsHelperClient::OnSaveURL(
     content::WebContents* contents) {
   RecordDownloadSource(DOWNLOAD_INITIATED_BY_PDF_SAVE);
 }
-
-void ChromePDFWebContentsHelperClient::OnShowPDFPasswordDialog(
-    content::WebContents* contents,
-    const base::string16& prompt,
-    const pdf::PasswordDialogClosedCallback& callback) {
-  ShowPDFPasswordDialog(contents, prompt, callback);
-}