Revert "Re-land deferred compositing updates with fixed assumptions"

LayoutTests/fast/events/touch/resources/compositor-touch-hit-rects.js

 function listener() {
 }
 
 function log(msg) {
     var span = document.createElement("span");
     document.getElementById("console").appendChild(span);
     span.innerHTML = msg + '<br />';
 }
 
 function nameForNode(node) {
@@ skipping 114 matching lines @@
 }
 
 if (window.internals) {
     window.internals.settings.setMockScrollbarsEnabled(true);
     window.internals.settings.setForceCompositingMode(true);
 }
 
 window.onload = function() {
     // Run each general test case.
     var tests = document.querySelectorAll('.testcase');
-    for ( var i = 0; i < tests.length; i++) {
-        // Force a compositing update before testing each case to ensure that
-        // any subsequent touch rect updates are actually done because of
-        // the event handler changes in the test itself.
-        window.internals.forceCompositingUpdate(document);
+    for ( var i = 0; i < tests.length; i++)
         testElement(tests[i]);
-    }
 
     if (window.additionalTests)
         additionalTests();
 
     if (!visualize && window.internals) {
         var testContainer = document.getElementById("tests");
         testContainer.parentNode.removeChild(testContainer);
     }
 
     document.documentElement.setAttribute('done', 'true');
 };