Remove legacy PDF JSON interface.

chrome/browser/resources/chromeos/chromevox/manifest.json.jinja2

 {
 {%if key is defined %}
   "key": "{{key}}",
 {% endif %}
   "manifest_version": 2,
   "name": "__MSG_CHROMEVOX_NAME__",
   "version": "{{set_version}}",
   "description": "__MSG_CHROMEVOX_DESCRIPTION__",
 {% if is_guest_manifest == '1' %}
   "incognito": "split",
@@ skipping 16 matching lines @@
     "virtualKeyboardPrivate",
     "<all_urls>"
   ],
   "content_scripts": [
     {
       "matches": [ "<all_urls>" ],
       "exclude_globs": [
           "chrome-extension://*",
           "chrome://*",
           "https://accounts.google.com/embedded/setup/chromeos*",
-          "https://talkgadget.google.com/hangouts*"
+          "https://talkgadget.google.com/hangouts*",
+          "*.pdf"

[David Tseng, 2016/06/28 19:53:30]

Have you tested this with an iframe src'ed to a pdf? I don't think we handle
that case.

[dmazzoni, 2016/06/29 20:50:21]

Good catch. I changed the whitelisting rules so that it checks the current
root for compat whitelisting, not just the top level root. It's obviously not
perfect since Classic won't automatically move focus into the plug-in, but
if you Tab into it, it switches to Compat now.

       ],
       "all_frames": true,
       "js": [
 {% if is_js_compressed == '1' %}
         "chromeVoxChromePageScript.js",
         "chromeVox2ChromePageScript.js"
 {% else %}
         "closure/closure_preinit.js",
         "closure/base.js",
         "deps.js",
@@ skipping 45 matching lines @@
     }
   },
   "options_page": "chromevox/background/options.html",
   "default_locale": "en",
   "icons": {
     "16": "images/chromevox-16.png",
     "48": "images/chromevox-48.png",
     "128": "images/chromevox-128.png"
   }
 }