DevTools: Fix a bug where user agent shadow dom elements were inspectable

third_party/WebKit/Source/devtools/front_end/elements/ElementsPanel.js

Index: third_party/WebKit/Source/devtools/front_end/elements/ElementsPanel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/elements/ElementsPanel.js b/third_party/WebKit/Source/devtools/front_end/elements/ElementsPanel.js
index 33e2b0dbf7c7f7385f8f4e6382a564c488cf3f1c..5da3bbefc0a7996ff53ddb95a0e92727285c6f61 100644
--- a/third_party/WebKit/Source/devtools/front_end/elements/ElementsPanel.js
+++ b/third_party/WebKit/Source/devtools/front_end/elements/ElementsPanel.js
@@ -868,8 +868,10 @@ WebInspector.ElementsPanel.prototype = {
      */
     _leaveUserAgentShadowDOM: function(node)
     {
-        var userAgentShadowRoot = node.ancestorUserAgentShadowRoot();
-        return userAgentShadowRoot ? /** @type {!WebInspector.DOMNode} */ (userAgentShadowRoot.parentNode) : node;
+        var userAgentShadowRoot;
+        while ((userAgentShadowRoot = node.ancestorUserAgentShadowRoot()) && userAgentShadowRoot.parentNode)
+            node = userAgentShadowRoot.parentNode;
+        return node;
     },
 
     /**