DevTools: fix author shadow dom inspection mode, speacial-case ua. Fix crash from the bug.

LayoutTests/inspector/elements/reveal-shadow-dom-node.html

Index: LayoutTests/inspector/elements/reveal-shadow-dom-node.html
diff --git a/LayoutTests/inspector/elements/reveal-shadow-dom-node.html b/LayoutTests/inspector/elements/reveal-shadow-dom-node.html
index f13f1c3b0c71ca1cf5242fd8e87de32706ab95a8..231aff01d8f628c81aa3f583d26e4e869c7be95a 100644
--- a/LayoutTests/inspector/elements/reveal-shadow-dom-node.html
+++ b/LayoutTests/inspector/elements/reveal-shadow-dom-node.html
@@ -32,7 +32,7 @@ function test()
             var shadowDiv = children[0];
             InspectorTest.addResult("User-agent shadow DOM hidden:");
             elementsPanel.revealAndSelectNode(shadowDiv.id);
-            WebInspector.settings.showShadowDOM.set(true);
+            WebInspector.settings.showUAShadowDOM.set(true);
             InspectorTest.addResult("User-agent shadow DOM shown:");
             elementsPanel.revealAndSelectNode(shadowDiv.id);
         }