DevTools: move emulation button into the base App.js.

Source/devtools/front_end/main/module.json

 {
     "extensions": [
         {
             "type": "@WebInspector.ContextMenu.Provider",
             "contextTypes": ["WebInspector.UISourceCode", "WebInspector.Resource", "WebInspector.NetworkRequest", "Node"],
             "className": "WebInspector.HandlerRegistry.ContextMenuProvider"
         },
         {
             "type": "@WebInspector.ActionDelegate",
             "actionId": "main.reload",
@@ skipping 106 matching lines @@
         },
         {
             "type": "@WebInspector.StatusBarButton.Provider",
             "className": "WebInspector.InspectElementModeController.ToggleButtonProvider",
             "location": "toolbar-left",
             "order": 0,
             "actionId": "main.toggle-element-search"
         },
         {
             "type": "@WebInspector.StatusBarButton.Provider",
-            "className": "WebInspector.AdvancedApp.ResponsiveDesignButtonProvider",
+            "className": "WebInspector.App.ResponsiveDesignButtonProvider",
             "order": 1,
             "location": "toolbar-left"
         },
         {
             "type": "@WebInspector.StatusBarButton.Provider",
             "className": "WebInspector.DockController.ButtonProvider",
             "order": 1,
             "location": "toolbar-right"
         },
         {
@@ skipping 22 matching lines @@
             "className": "WebInspector.Main.ShortcutPanelSwitchSettingDelegate"
         },
         {
             "type": "ui-setting",
             "section": "Extensions",
             "settingType": "custom",
             "className": "WebInspector.HandlerRegistry.OpenAnchorLocationSettingDelegate"
         }
     ]
 }