Always trust internal PDF viewer.

chrome/browser/resources/plugin_metadata/plugins_chromeos.json

 {
-  "x-version": 2,
+  "x-version": 3,
   "google-talk": {
     "mime_types": [
     ],
     "versions": [
       {
         "version": "0",
         "status": "requires_authorization",
         "comment": "'Google Talk Plugin' and 'Google Talk Plugin Video Accelerator' are bundled with ChromeOS, so we don't define a minimum version."
       }
     ],
@@ skipping 16 matching lines @@
     "url": "http://get.adobe.com/flashplayer/",
     "displayurl": true,
     "group_name_matcher": "*Shockwave Flash*"
   },
   "google-chrome-pdf": {
     "mime_types": [
     ],
     "versions": [
       {
         "version": "0",
-        "status": "up_to_date",
+        "status": "fully_trusted",
         "comment": "Google Chrome PDF has no version information."
       }
     ],
     "name": "Chrome PDF Viewer",
     "group_name_matcher": "*Chrome PDF Viewer*"
   },
   "chromium-pdf": {
     "mime_types": [
     ],
     "versions": [
       {
         "version": "0",
-        "status": "up_to_date",
-        "comment": "Chrome PDF Viewer has no version information."
+        "status": "fully_trusted",
+        "comment": "Chromium PDF Viewer has no version information."
       }
     ],
     "name": "Chromium PDF Viewer",
     "group_name_matcher": "*Chromium PDF Viewer*"
   }
 }