NoIssue - Use localStorage for storing filters in current Windows Store version of ABP for Edge

lib/adblockplus.js

Index: lib/adblockplus.js
===================================================================
--- a/lib/adblockplus.js
+++ b/lib/adblockplus.js
@@ -360,27 +360,28 @@
   function loadFile(file, successCallback, errorCallback)
   {
     var key = fileToKey(file);
-    ext.storage.get([key], function(items)
-    {
-      var entry = items[key];
-      if (entry)
-      {
-        successCallback(entry);
-      }
-      else
-      {
-        errorCallback(new Error("File doesn't exist"));
-      }
-    });
+    dataInJson = localStorage.getItem(key);
+    if (dataInJson != null)

[kzar, 2016/07/27 08:44:21]

Perhaps just check if dataInJson is truthy like the previous code did? (The `!=
null` comparison makes me nervous since the data could apparently be either null
or a string at this point.)

Nit: I liked the name entry better than dataInJson.

+      successCallback(JSON.parse(dataInJson));
+    else
+      errorCallback(new Error("File doesn't exist"));
   }
 
   function saveFile(file, data, callback)
   {
-    ext.storage.set(fileToKey(file),
-    {
-      content: data,
-      lastModified: Date.now()
-    }, callback);
+    try
+    {
+      localStorage.setItem(fileToKey(file), JSON.stringify({

[kzar, 2016/07/27 08:44:21]

Nit: The indentation here looks kind of weird. How about this?

localStorage.setItem(fileToKey(file), JSON.stringify({
  content: data,
  lastModified: Date.now()
}));

+                                                content: data,
+                                                lastModified: Date.now()
+                                            }
+                          ));
+    }
+    catch(error)
+    {
+      // QuotaExceededError can happen. Ignore silently

[kzar, 2016/07/27 08:44:21]

Maybe we should display an alert that asks the user to remove some
subscriptions?

+    }
+    callback();
   }
   exports.IO = {
     resolveFilePath: function(path)