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

third_party/WebKit/LayoutTests/virtual/threaded/fast/canvas-toBlob/canvas-toBlob-case-insensitive-mimetype.html

-<script src = "../../../../resources/js-test.js"></script>
-<script type = "text/javascript"> 
-if (window.testRunner)
-{
-    testRunner.dumpAsText();
-    testRunner.waitUntilDone();
-}
-
-description("Test that toBlob(mimeType) ignores the case of 'mimeType'.");
-
-canvas = document.createElement('canvas');
-var counter;
-
-function tryMimeType(mimeType, expectedMimeType)
-{
-    canvas.toBlob(function(blob) {
-        if (blob.type === expectedMimeType) {
-            testPassed("");
-        }
-        else {
-            testFailed(blob.type + " does not match " + expectedMimeType);
-        }
-        counter = counter - 1;
-        if (window.testRunner) {
-            if (counter == 0) {
-                testRunner.notifyDone();
-            }
-        }
-    }, mimeType);
-}
-
-counter = 4;
-
-//Note that due to the async nature of toBlob, these callbacks may complete
-// at random order but they will all print PASS when they pass.
-tryMimeType("image/PNG", "image/png");
-
-tryMimeType("imaGE/jpEg", "image/jpeg");
-
-tryMimeType("ImAgE/WeBp", "image/webp");
-
-//Unsupported mime type falls back to png
-tryMimeType("image/bmp", "image/png");
-
-</Script>