Allow touch adjustment to return Shadow DOM node.

LayoutTests/touchadjustment/html-label.html

Index: LayoutTests/touchadjustment/html-label.html
diff --git a/LayoutTests/touchadjustment/html-label.html b/LayoutTests/touchadjustment/html-label.html
index ce1d8a21b25656661b10372fb8a5aaeea6875b05..c36136ef00b5dd86c85b42617244db9e6d88b5ff 100644
--- a/LayoutTests/touchadjustment/html-label.html
+++ b/LayoutTests/touchadjustment/html-label.html
@@ -40,14 +40,14 @@
     function testDirectTouch(element)
     {
         var touchpoint = offsetTouchPoint(findAbsoluteBounds(element), 'center', 0, 20, 30);
-        testTouchPoint(touchpoint, element);
+        testTouchPoint(touchpoint, element, /* allowTextNodes */ false, /* disallowShadowDOM */ true);
     }
 
     function testIndirectTouch(element, offset)
     {
         // Touch just right of the element.
         var touchpoint = offsetTouchPoint(findAbsoluteBounds(element), 'right', offset, 30, 20);
-        testTouchPoint(touchpoint, element);
+        testTouchPoint(touchpoint, element, /* allowTextNodes */ false, /* disallowShadowDOM */ true);
     }
 
     function testDirectTouches()