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

Source/devtools/front_end/Settings.js

Index: Source/devtools/front_end/Settings.js
diff --git a/Source/devtools/front_end/Settings.js b/Source/devtools/front_end/Settings.js
index a562c423f5caf33f5d5b8643be0d01f163ecfdca..9e69afe06bfa3e6e3d26135a2cd89826ab2d25d2 100644
--- a/Source/devtools/front_end/Settings.js
+++ b/Source/devtools/front_end/Settings.js
@@ -76,10 +76,7 @@ WebInspector.Settings = function()
     this.deviceFitWindow = this.createSetting("deviceFitWindow", true);
     this.emulateViewport = this.createSetting("emulateViewport", false);
     this.emulateTouchEvents = this.createSetting("emulateTouchEvents", false);
-
-    // This setting affects the display of user-agent shadow DOM only,
-    // as author shadow DOM is displayed at all times.
-    this.showShadowDOM = this.createSetting("showShadowDOM", false);
+    this.showUAShadowDOM = this.createSetting("showUAShadowDOM", false);
     this.savedURLs = this.createSetting("savedURLs", {});
     this.javaScriptDisabled = this.createSetting("javaScriptDisabled", false);
     this.overrideGeolocation = this.createSetting("overrideGeolocation", false);