Make extension file URL access opt-in.

chrome/test/data/extensions/good/Preferences

 {
    "extensions": {
       "settings": {
          "behllobkkfkfnphdnhnkndlbkcpglgmj": {
             "location": 1,
             "path": "behllobkkfkfnphdnhnkndlbkcpglgmj/1.0.0.0",
             "granted_permissions": {
               "full": false,
               "api": ["tabs"],
               "host": ["file://*", "http://*.google.com/*", "https://*.google.com/*", "http://*.news.com/*"]
             },
             "state": 1,
-            "allowFileAccess": true,
+            "newAllowFileAccess": true,
             "manifest": {
               "key": "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDuUZGKCDbff6IRaxa4Pue7PPkxwPaNhGT3JEqppEsNWFjM80imEdqMbf3lrWqEfaHgaNku7nlpwPO1mu3/4Hr+XdNa5MhfnOnuPee4hyTLwOs3Vzz81wpbdzUxZSi2OmqMyI5oTaBYICfNHLwcuc65N5dbt6WKGeKgTpp4v7j7zwIDAQAB",
               "version": "1.0.0.0",
               "name": "My extension 1",
               "description": "The first extension that I made.",
               "icons": {
                 "128": "icon_128.png"
               },
               "default_locale": "en_US",
               "background_page": "backgroundpage.html",
@@ skipping 42 matching lines @@
               "plugins": [
                 { "path": "content_plugin.dll", "public": true },
                 { "path": "extension_plugin.dll" }
               ],
               "background_page": "background.html"
             }
          }
       }
    }
 }