[DevTools] Remove unnecessary emulation checkboxes and simplify UX.

Source/devtools/front_end/main/Main.js

Index: Source/devtools/front_end/main/Main.js
diff --git a/Source/devtools/front_end/main/Main.js b/Source/devtools/front_end/main/Main.js
index 34dac490acb373822e526313aed333ebbcd435ef..db2fca96666292ddc05d700a7fa4a2d7bce9b6b6 100644
--- a/Source/devtools/front_end/main/Main.js
+++ b/Source/devtools/front_end/main/Main.js
@@ -282,6 +282,7 @@ WebInspector.Main.prototype = {
     _doLoadedDoneWithCapabilities: function(mainTarget)
     {
         WebInspector.dockController = new WebInspector.DockController(!!WebInspector.queryParam("can_dock"));
+        WebInspector.overridesSupport = new WebInspector.OverridesSupport(WebInspector.experimentsSettings.responsiveDesign.isEnabled() && WebInspector.dockController.canDock());
 
         if (mainTarget.canScreencast)
             WebInspector.app = new WebInspector.ScreencastApp();
@@ -347,8 +348,6 @@ WebInspector.Main.prototype = {
 
         new WebInspector.WorkspaceController(WebInspector.workspace);
 
-        WebInspector.overridesSupport = new WebInspector.OverridesSupport(WebInspector.experimentsSettings.responsiveDesign.isEnabled() && WebInspector.dockController.canDock());
-
         WebInspector.liveEditSupport = new WebInspector.LiveEditSupport(WebInspector.workspace);
         new WebInspector.CSSStyleSheetMapping(WebInspector.cssModel, WebInspector.workspace, WebInspector.networkWorkspaceBinding);