Call NodeFilter.acceptNode() with correct this value

LayoutTests/fast/dom/TreeWalker/acceptNode-filter-expected.txt

 Test JS objects as NodeFilters.
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
 Testing with raw function filter
- filtering node A1
+ filtering node A1 [this=[object Window]]
 PASS walker.firstChild(); walker.currentNode.id is 'A1'
- filtering node B1
- filtering node B2
+ filtering node B1 [this=[object Window]]
+ filtering node B2 [this=[object Window]]
+PASS walker.nextNode(); walker.currentNode.id is 'B2'
+
+Testing with strict raw function filter
+ filtering node A1 [this=undefined]
+PASS walker.firstChild(); walker.currentNode.id is 'A1'
+ filtering node B1 [this=undefined]
+ filtering node B2 [this=undefined]
 PASS walker.nextNode(); walker.currentNode.id is 'B2'
 
 Testing with object filter
- filtering node A1
+ filtering node A1 [this=custom node filter]
 PASS walker.firstChild(); walker.currentNode.id is 'A1'
- filtering node B1
- filtering node B2
+ filtering node B1 [this=custom node filter]
+ filtering node B2 [this=custom node filter]
 PASS walker.nextNode(); walker.currentNode.id is 'B2'
 
 Testing with null filter
 PASS walker.firstChild(); walker.currentNode.id is 'A1'
 PASS walker.nextNode(); walker.currentNode.id is 'B1'
 
 Testing with undefined filter
 PASS walker.firstChild(); walker.currentNode.id is 'A1'
 PASS walker.nextNode(); walker.currentNode.id is 'B1'
 
@@ skipping 16 matching lines @@
 Testing acceptNode callee
 Callee: function (node) {
     debug('Callee: ' + arguments.callee);
     return NodeFilter.FILTER_ACCEPT;
   }
 PASS walker.firstChild(); walker.currentNode.id is 'A1'
 PASS successfullyParsed is true
 
 TEST COMPLETE