Bug 1260630 - Don't use a CPOW to change style in content in browser_computed_refresh-on-style-change_01.js; r=bgrins

MozReview-Commit-ID: 5tRJTzQLl2V

--HG--
extra : rebase_source : ef28bb5449af3661fb7d26c7186f634137d55afe

devtools/client/inspector/computed/test/browser_computed_refresh-on-style-change_01.js

@@ -9,9 +9,9 @@
 
 const TEST_URI = "<div id='testdiv' style='font-size:10px;'>Test div!</div>";
 
-add_task(function*() {
+add_task(function* () {
   yield addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
-  let {inspector, view} = yield openComputedView();
+  let {inspector, view, testActor} = yield openComputedView();
   yield selectNode("#testdiv", inspector);
 
   let fontSize = getComputedViewPropertyValue(view, "font-size");
@@ -19,9 +19,8 @@ add_task(function*() {
 
   info("Changing the node's style and waiting for the update");
   let onUpdated = inspector.once("computed-view-refreshed");
-  // FIXME: use the testActor to set style on the node.
-  content.document.querySelector("#testdiv")
-                  .style.cssText = "font-size: 15px; color: red;";
+  yield testActor.setAttribute("#testdiv", "style",
+                               "font-size: 15px; color: red;");
   yield onUpdated;
 
   fontSize = getComputedViewPropertyValue(view, "font-size");