Refactored the abstraction layer to address prerendered pages on Safari caused by leaky abstraction

lib/whitelisting.js

Index: lib/whitelisting.js
===================================================================
--- a/lib/whitelisting.js
+++ b/lib/whitelisting.js
@@ -18,7 +18,7 @@
 let {defaultMatcher} = require("matcher");
 let {WhitelistFilter} = require("filterClasses");
 
-let tabsWithKeyException = new TabMap(true);
+let pagesWithKeyException = new ext.PageMap();
 
 let isWhitelisted = exports.isWhitelisted = function(url, parentUrl, type)
 {
@@ -32,9 +32,9 @@
   return (filter instanceof WhitelistFilter ? filter : null);
 };
 
-let isFrameWhitelisted = exports.isFrameWhitelisted = function(tab, frame, type)
+let isFrameWhitelisted = exports.isFrameWhitelisted = function(page, frame, type)
 {
-  let urlsWithKeyException = tabsWithKeyException.get(tab);
+  let urlsWithKeyException = pagesWithKeyException.get(page);
 
   for (; frame != null; frame = frame.parent)
   {
@@ -69,24 +69,24 @@
   return verifySignature(key, signature, params.join("\0"));
 };
 
-let recordKeyException = function(tab, url)
+let recordKeyException = function(page, url)
 {
-  let urlsWithKeyException = tabsWithKeyException.get(tab);
+  let urlsWithKeyException = pagesWithKeyException.get(page);
 
   if (!urlsWithKeyException)
   {
     urlsWithKeyException = {__proto__: null};
-    tabsWithKeyException.set(tab, urlsWithKeyException);
+    pagesWithKeyException.set(page, urlsWithKeyException);
   }
 
   urlsWithKeyException[url] = null;
 };
 
-let processKeyException = exports.processKeyException = function(token, tab, frame)
+let processKeyException = exports.processKeyException = function(token, page, frame)
 {
   let url = stripFragmentFromURL(frame.url);
   let docDomain = extractHostFromURL((frame.parent || frame).url);
 
   if (verifyKeyException(token, url, docDomain))
-    recordKeyException(tab, url);
+    recordKeyException(page, url);
 };