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

components/pdf/browser/pdf_web_contents_helper.h

 // 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.
 
 #ifndef COMPONENTS_PDF_BROWSER_PDF_WEB_CONTENTS_HELPER_H_
 #define COMPONENTS_PDF_BROWSER_PDF_WEB_CONTENTS_HELPER_H_
 
 #include <memory>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 #include "ipc/ipc_message.h"
 
 namespace content {
 class WebContents;
 }
 
 namespace pdf {
 
-class OpenPDFInReaderPromptClient;
 class PDFWebContentsHelperClient;
 
 // Per-WebContents class to handle PDF messages.
 class PDFWebContentsHelper
     : public content::WebContentsObserver,
       public content::WebContentsUserData<PDFWebContentsHelper> {
  public:
   static void CreateForWebContentsWithClient(
       content::WebContents* contents,
       std::unique_ptr<PDFWebContentsHelperClient> client);
 
-  OpenPDFInReaderPromptClient* open_in_reader_prompt() const {
-    return open_in_reader_prompt_.get();
-  }
-
-  void ShowOpenInReaderPrompt(
-      std::unique_ptr<OpenPDFInReaderPromptClient> prompt);
-
  private:
   PDFWebContentsHelper(content::WebContents* web_contents,
                        std::unique_ptr<PDFWebContentsHelperClient> client);
   ~PDFWebContentsHelper() override;
 
   // content::WebContentsObserver overrides:
   bool OnMessageReceived(const IPC::Message& message,
                          content::RenderFrameHost* render_frame_host) override;
-  void DidNavigateMainFrame(
-      const content::LoadCommittedDetails& details,
-      const content::FrameNavigateParams& params) override;
-
-  // Internal helpers ----------------------------------------------------------
-
-  void UpdateLocationBar();
 
   // Message handlers.
   void OnHasUnsupportedFeature();
   void OnSaveURLAs(const GURL& url, const content::Referrer& referrer);
   void OnUpdateContentRestrictions(int content_restrictions);
 
-  // The model for the confirmation prompt to open a PDF in Adobe Reader.
-  std::unique_ptr<OpenPDFInReaderPromptClient> open_in_reader_prompt_;
   std::unique_ptr<PDFWebContentsHelperClient> client_;
 
   DISALLOW_COPY_AND_ASSIGN(PDFWebContentsHelper);
 };
 
 }  // namespace pdf
 
 #endif  // COMPONENTS_PDF_BROWSER_PDF_WEB_CONTENTS_HELPER_H_