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

components/pdf/browser/pdf_web_contents_helper.h

Index: components/pdf/browser/pdf_web_contents_helper.h
diff --git a/components/pdf/browser/pdf_web_contents_helper.h b/components/pdf/browser/pdf_web_contents_helper.h
index 85d7d02a396ce629d38676ff4db8fb196563c5e6..c9a2e5897d08e94dc2aef43b6e6e9de331811404 100644
--- a/components/pdf/browser/pdf_web_contents_helper.h
+++ b/components/pdf/browser/pdf_web_contents_helper.h
@@ -20,7 +20,6 @@ class WebContents;
 
 namespace pdf {
 
-class OpenPDFInReaderPromptClient;
 class PDFWebContentsHelperClient;
 
 // Per-WebContents class to handle PDF messages.
@@ -32,13 +31,6 @@ class PDFWebContentsHelper
       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);
@@ -47,21 +39,12 @@ class PDFWebContentsHelper
   // 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);