Sync Blob.close() behavior wrt updated spec.

LayoutTests/fast/files/blob-close-revoke.html

Index: LayoutTests/fast/files/blob-close-revoke.html
diff --git a/LayoutTests/fast/files/blob-close-revoke.html b/LayoutTests/fast/files/blob-close-revoke.html
index f1073f41cba2c3cf1f1087f09db2f43331707ed2..5a1f5626dc28f7379963c0ac3f9a0d7a567af994 100644
--- a/LayoutTests/fast/files/blob-close-revoke.html
+++ b/LayoutTests/fast/files/blob-close-revoke.html
@@ -91,24 +91,19 @@ function testRevokeAfterClose()
     img.src = blobURL1;
 }
 
-function testRegisterAfterClose()
+function testCreateAfterClose()
 {
     debug("Test creating object URLs on closed Blobs");
     blob = new Blob(["body{background: green}"], {type: "text/css"});
-    blobURL1 = window.URL.createObjectURL(blob);
     blob.close();
-    // Verifies createObjectURL() still works and returns a valid (non-empty) URL
-    // without throwing an error. See http://crbug.com/344820 for this requirement.
-    blobURL2 = window.URL.createObjectURL(blob);
-    shouldBeTrue("blobURL1 !== blobURL2");
-    shouldBeTrue("blobURL2.length > 0");
+    shouldThrow("window.URL.createObjectURL(blob);");
     runNextTest();
 }
 
 var tests = [
     testRevokeAfterClose,
     testRevokeAfterCloseWorkers,
-    testRegisterAfterClose ];
+    testCreateAfterClose ];
 
 function runNextTest()
 {