Honor the wheel event canScroll bit instead of trying to infer it from the ctrl modifier

LayoutTests/fast/events/wheelevent-ctrl-expected.txt

Index: LayoutTests/fast/events/wheelevent-ctrl-expected.txt
diff --git a/LayoutTests/fast/events/wheelevent-ctrl-expected.txt b/LayoutTests/fast/events/wheelevent-ctrl-expected.txt
index 967df05fa9f1ebd05a009d3e860f7a38893bb4f4..774399a9edebae7a94983709c88beebc4975ee19 100644
--- a/LayoutTests/fast/events/wheelevent-ctrl-expected.txt
+++ b/LayoutTests/fast/events/wheelevent-ctrl-expected.txt
@@ -14,28 +14,33 @@ On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE
 
 
 Test mousewheel events over scrollable div
-With ctrl modifier set
+With ctrl modifier set and canScroll set to be false
 PASS wheelEventCount is 1
 PASS deltaY is 80
 PASS ctrlKey is true
 PASS testDiv.scrollTop is 0
-Without ctrl
+Without ctrl and canScroll set to be default true
 PASS wheelEventCount is 1
 PASS deltaY is 80
 PASS ctrlKey is false
 PASS testDiv.scrollTop is deltaY
 
 Test mousewheel events over the document
-With ctrl modifier set
+With ctrl modifier set and canScroll set to be false
 PASS wheelEventCount is 1
 PASS deltaY is 80
 PASS ctrlKey is true
-PASS document.body.scrollTop is 0
-Now without ctrl
+PASS window.scrollY is 0
+With ctrl modifier set and canScroll set to be true
 PASS wheelEventCount is 1
 PASS deltaY is 80
-PASS ctrlKey is false
+PASS ctrlKey is true
 PASS window.scrollY is deltaY
+Now without ctrl and canScroll set to be default true
+PASS wheelEventCount is 1
+PASS deltaY is 80
+PASS ctrlKey is false
+PASS window.scrollY is 160
 PASS successfullyParsed is true
 
 TEST COMPLETE