Only report bounding box touch hit rect for non-composited scroll layers.

LayoutTests/fast/events/touch/compositor-touch-hit-rects.html

Index: LayoutTests/fast/events/touch/compositor-touch-hit-rects.html
diff --git a/LayoutTests/fast/events/touch/compositor-touch-hit-rects.html b/LayoutTests/fast/events/touch/compositor-touch-hit-rects.html
index e62faa7304af884ce8c9e5e420adf92fab101d21..0361a4f661dd9f05e9ba95eaaeb86faa9999cb28 100644
--- a/LayoutTests/fast/events/touch/compositor-touch-hit-rects.html
+++ b/LayoutTests/fast/events/touch/compositor-touch-hit-rects.html
@@ -40,13 +40,6 @@
 #transform3dChild {
   -webkit-transform: rotate3d(0.2, 1, 0, 50grad);
 }
-#scrollContainer {
-  overflow-y: scroll;
-  /* Make this just big enough for clipping to occur so we can verify the 
-     hit rect is also clipped. */
-  height: 23px;
-  border: 1px solid lightgrey;
-}
 #list > li {
   /* Move the list item over to make sure it doesn't overlap with the list itself */
   -webkit-transform: translate(300px, 0);
@@ -120,11 +113,6 @@ to quickly validate graphically.</p>
   <div class="testcase" id="styleModified">
     Style modified dynamically
   </div>
-  <div id="scrollContainer">
-    <div style='height: 13px;'></div>
-    <div class="testcase" id="scrollContent">Scroll content</div>
-    <div style='height: 50px;'></div>
-  </div>
   <div class="testcase" id="containsSvg">
     <svg id="svg1">
       <line x1="0" y1="5" x2="100" y2="5" stroke-width="3" stroke="black"/>