Remove legacy PDF JSON interface.

chrome/browser/resources/pdf/pdf.js

Index: chrome/browser/resources/pdf/pdf.js
diff --git a/chrome/browser/resources/pdf/pdf.js b/chrome/browser/resources/pdf/pdf.js
index dab584d9d0bdc9afb6d3a68f1631627bba6bd8ac..d4beae6f9cb67452e8f9801ab982b911f3bd0990 100644
--- a/chrome/browser/resources/pdf/pdf.js
+++ b/chrome/browser/resources/pdf/pdf.js
@@ -604,9 +604,6 @@ PDFViewer.prototype = {
             '&body=' + message.data.body;
         window.location.href = href;
         break;
-      case 'getAccessibilityJSONReply':
-        this.sendScriptingMessage_(message.data);
-        break;
       case 'getPassword':
         // If the password screen isn't up, put it up. Otherwise we're
         // responding to an incorrect password so deny it.
@@ -782,7 +779,6 @@ PDFViewer.prototype = {
     }
 
     switch (message.data.type.toString()) {
-      case 'getAccessibilityJSON':
       case 'getSelectedText':
       case 'print':
       case 'selectAll':