Convert some text-based-repaint tests for spv2

LayoutTests/paint/invalidation/spv2/resources/paint-invalidation-test.js

 // Asynchronous tests should manually call finishPaintInvalidationTest at the appropriate time.
 window.testIsAsync = false;
 
 // All paint invalidation tests are asynchronous from test-runner's point of view.
 if (window.testRunner)
     testRunner.waitUntilDone();
 
 function runPaintInvalidationTest()
 {
     if (!window.testRunner || !window.internals) {
@@ skipping 41 matching lines @@
             testRunner.logToStderr(message);
             while (document.body.firstChild)
                 document.body.removeChild(document.body.firstChild);
             var pre = document.createElement('pre');
             pre.appendChild(document.createTextNode('(To copy results as text, see stderr.)\n\n' + message));
             document.body.appendChild(pre);
         }
         testRunner.notifyDone();
     });
 }
-
-setTimeout(function() {
-    testRunner.notifyDone();
-}, 2000);