DevTools: fix inspector-protocol css tests

LayoutTests/inspector-protocol/css/css-shadow-host-rule.html

Index: LayoutTests/inspector-protocol/css/css-shadow-host-rule.html
diff --git a/LayoutTests/inspector-protocol/css/css-shadow-host-rule.html b/LayoutTests/inspector-protocol/css/css-shadow-host-rule.html
index dc551accccffecfab1883ac5b3ab61a805e106c3..908abd022fa0ff89631bdfd7df14a953a7b4e86b 100644
--- a/LayoutTests/inspector-protocol/css/css-shadow-host-rule.html
+++ b/LayoutTests/inspector-protocol/css/css-shadow-host-rule.html
@@ -5,11 +5,19 @@
 <script type="text/javascript">
 function test()
 {
-    InspectorTest.sendCommandOrDie("CSS.enable", {}, onCSSEnabled);
+    var documentNodeId;
+
+    InspectorTest.requestDocumentNodeId(onDocumentNodeId);
+
+    function onDocumentNodeId(nodeId)
+    {
+        documentNodeId = nodeId;
+        InspectorTest.sendCommandOrDie("CSS.enable", {}, onCSSEnabled);
+    }
 
     function onCSSEnabled()
     {
-        InspectorTest.requestNodeId("#shadow-host", onNodeReceived);
+        InspectorTest.requestNodeId(documentNodeId, "#shadow-host", onNodeReceived);
     }
 
     function onNodeReceived(nodeId)