Remove dead code since PDFWebContentsHelper::ShowOpenInReaderPrompt isn't called anymore.

components/pdf/browser/pdf_web_contents_helper.cc

 // Copyright (c) 2012 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 "components/pdf/browser/pdf_web_contents_helper.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/strings/utf_string_conversions.h"
-#include "components/pdf/browser/open_pdf_in_reader_prompt_client.h"
 #include "components/pdf/browser/pdf_web_contents_helper_client.h"
 #include "components/pdf/common/pdf_messages.h"
-#include "content/public/browser/navigation_details.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(pdf::PDFWebContentsHelper);
 
 namespace pdf {
 
 // static
 void PDFWebContentsHelper::CreateForWebContentsWithClient(
     content::WebContents* contents,
     std::unique_ptr<PDFWebContentsHelperClient> client) {
   if (FromWebContents(contents))
     return;
   contents->SetUserData(UserDataKey(),
                         new PDFWebContentsHelper(contents, std::move(client)));
 }
 
 PDFWebContentsHelper::PDFWebContentsHelper(
     content::WebContents* web_contents,
     std::unique_ptr<PDFWebContentsHelperClient> client)
     : content::WebContentsObserver(web_contents), client_(std::move(client)) {}
 
 PDFWebContentsHelper::~PDFWebContentsHelper() {
 }
 
-void PDFWebContentsHelper::ShowOpenInReaderPrompt(
-    std::unique_ptr<OpenPDFInReaderPromptClient> prompt) {
-  open_in_reader_prompt_ = std::move(prompt);
-  UpdateLocationBar();
-}
-
 bool PDFWebContentsHelper::OnMessageReceived(
     const IPC::Message& message,
     content::RenderFrameHost* render_frame_host) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PDFWebContentsHelper, message)
     IPC_MESSAGE_HANDLER(PDFHostMsg_PDFHasUnsupportedFeature,
                         OnHasUnsupportedFeature)
     IPC_MESSAGE_HANDLER(PDFHostMsg_PDFSaveURLAs, OnSaveURLAs)
     IPC_MESSAGE_HANDLER(PDFHostMsg_PDFUpdateContentRestrictions,
                         OnUpdateContentRestrictions)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
-void PDFWebContentsHelper::DidNavigateMainFrame(
-    const content::LoadCommittedDetails& details,
-    const content::FrameNavigateParams& params) {
-  if (open_in_reader_prompt_.get() &&
-      open_in_reader_prompt_->ShouldExpire(details)) {
-    open_in_reader_prompt_.reset();
-    UpdateLocationBar();
-  }
-}
-
-void PDFWebContentsHelper::UpdateLocationBar() {
-  client_->UpdateLocationBar(web_contents());
-}
-
 void PDFWebContentsHelper::OnHasUnsupportedFeature() {
   client_->OnPDFHasUnsupportedFeature(web_contents());
 }
 
 void PDFWebContentsHelper::OnSaveURLAs(const GURL& url,
                                        const content::Referrer& referrer) {
   client_->OnSaveURL(web_contents());
   web_contents()->SaveFrame(url, referrer);
 }
 
 void PDFWebContentsHelper::OnUpdateContentRestrictions(
     int content_restrictions) {
   client_->UpdateContentRestrictions(web_contents(), content_restrictions);
 }
 
 }  // namespace pdf