Remove legacy PDF JSON interface.

chrome/browser/resources/chromeos/chromevox/cvox2/background/background.js

 // 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.
 
 /**
  * @fileoverview The entry point for all ChromeVox2 related code for the
  * background page.
  */
 
 goog.provide('Background');
@@ skipping 196 matching lines @@
       chrome.automation.getFocus(function(focus) {
         target = focus;
       });
     } else {
       target = this.getCurrentRange().start.node;
     }
 
     if (!target)
       return ChromeVoxMode.CLASSIC;
 
+    var root = target.root;
+    if (root && this.isWhitelistedForCompat_(root.docUrl))
+      return ChromeVoxMode.COMPAT;
+
     // Closure complains, but clearly, |target| is not null.
-    var root =
+    var topLevelRoot =
         AutomationUtil.getTopLevelRoot(/** @type {!AutomationNode} */(target));
-    if (!root)
+    if (!topLevelRoot)
       return ChromeVoxMode.COMPAT;
-    if (this.isWhitelistedForCompat_(root.docUrl))
+    if (this.isWhitelistedForCompat_(topLevelRoot.docUrl))
       return ChromeVoxMode.COMPAT;
-    else if (this.isWhitelistedForNext_(root.docUrl))
+    else if (this.isWhitelistedForNext_(topLevelRoot.docUrl))
       return ChromeVoxMode.NEXT;
     else
       return ChromeVoxMode.CLASSIC;
   },
 
   /**
    * Handles a mode change.
    * @param {ChromeVoxMode} newMode
    * @param {?ChromeVoxMode} oldMode Can be null at startup when no range was
    *  previously set.
@@ skipping 995 matching lines @@
   return new RegExp('^(' + globs.map(function(glob) {
     return glob.replace(/[.+^$(){}|[\]\\]/g, '\\$&')
         .replace(/\*/g, '.*')
         .replace(/\?/g, '.');
   }).join('|') + ')$');
 };
 
 new Background();
 
 });  // goog.scope