Get rid of custom code for Document::createTouchList()

LayoutTests/fast/events/touch/document-create-touch-list-crash-expected.txt

Index: LayoutTests/fast/events/touch/document-create-touch-list-crash-expected.txt
diff --git a/LayoutTests/fast/events/touch/document-create-touch-list-crash-expected.txt b/LayoutTests/fast/events/touch/document-create-touch-list-crash-expected.txt
index 848712ae2c95af870b5f10788beb7e661c40ec27..438e53578e7fb59a914fd6b6393de7c2d63a2d20 100644
--- a/LayoutTests/fast/events/touch/document-create-touch-list-crash-expected.txt
+++ b/LayoutTests/fast/events/touch/document-create-touch-list-crash-expected.txt
@@ -3,16 +3,12 @@ This test ensures that WebKit doesn't crash when the document.createTouchList AP
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
 
-PASS document.createTouchList(document).item(0) is null
-PASS document.createTouchList({"a":1}).item(0) is null
-PASS document.createTouchList(new Array(5)).item(0) is null
-PASS document.createTouchList("string").item(0) is null
-PASS document.createTouchList(null).item(0) is null
-PASS document.createTouchList(undefined).item(0) is null
-PASS tl.length is 3
-PASS tl.item(0) is non-null.
-PASS tl.item(1) is null
-PASS tl.item(2) is non-null.
+PASS document.createTouchList(document).item(0) threw exception TypeError: Type error.
+PASS document.createTouchList({"a":1}).item(0) threw exception TypeError: Type error.
+PASS document.createTouchList(new Array(5)).item(0) threw exception TypeError: Type error.
+PASS document.createTouchList("string").item(0) threw exception TypeError: Type error.
+PASS document.createTouchList(null).item(0) threw exception TypeError: Type error.
+PASS document.createTouchList(undefined).item(0) threw exception TypeError: Type error.
 PASS successfullyParsed is true
 
 TEST COMPLETE