Fix race condition in test

sky/tests/editing/delete_block_contents.sky

Index: sky/tests/editing/delete_block_contents.sky
diff --git a/sky/tests/editing/delete_block_contents.sky b/sky/tests/editing/delete_block_contents.sky
index 833bcc0f878736bd835d5d97d780af69a634ce7e..9fb308533d9dbf519333c3cb03768fa61c47d592 100644
--- a/sky/tests/editing/delete_block_contents.sky
+++ b/sky/tests/editing/delete_block_contents.sky
@@ -4,8 +4,8 @@
 This test verifies that the height of an editable block remains the same after adding block elements and removing them.
 <div contenteditable="true" style="border: solid blue" id="test"></div>
 <script>
-describe("height of an editable block", function(done) {
-  it("remains the same after adding block elements and removing them", function() {
+describe("height of an editable block", function() {
+  it("remains the same after adding block elements and removing them", function(done) {
     var elem = document.getElementById("test");
     var originalHeight = elem.offsetHeight;
     var d = elem.appendChild(document.createElement('div'));