Remove virtual test suits virtual/threaded/fast/canvas-toBlob

third_party/WebKit/LayoutTests/virtual/threaded/fast/canvas-toBlob/canvas-toBlob-invalid.html

-<script src="../../../../resources/js-test.js"></script>
-<script type='text/javascript'>
-description("Test the handling of invalid arguments in canvas toBlob().");
-
-if (window.testRunner) {
-    testRunner.dumpAsText();
-    testRunner.waitUntilDone();
-}
-
-var numAsyncCalls = 2;
-function finishOneAsyncCall()
-{
-    numAsyncCalls--;
-    if (numAsyncCalls == 0 && window.testRunner) {
-        testRunner.notifyDone();
-    }
-}
-
-var canvas = document.createElement('canvas');
-var ctx = canvas.getContext("2d"); 
-ctx.strokeStyle = "red";
-ctx.strokeRect(0, 0, 50, 50);
-
-shouldThrow("canvas.toBlob();");
-shouldThrow("canvas.toBlob(null);");
-shouldThrow("canvas.toBlob(undefined);");
-// Passing the callback argument without blob handle silently fails.
-shouldNotThrow("canvas.toBlob(function() { finishOneAsyncCall(); });");
-
-// Invalid quality argument will fall back to default value
-shouldNotThrow("canvas.toBlob(function(blob) { finishOneAsyncCall(); }, 'image/jpeg', 500)");
-</script>