[DevTools] Extract DeviceModeButton from AdvancedApp.

Source/devtools/front_end/main/module.json

 {
     "extensions": [
         {
             "type": "@WebInspector.AppProvider",
             "condition": "can_dock",
             "className": "WebInspector.AdvancedAppProvider",
             "order": 0
         },
         {
             "type": "@WebInspector.AppProvider",
@@ skipping 125 matching lines @@
                     "platform": "windows,linux",
                     "shortcut": "Ctrl+0 Ctrl+Numpad0"
                 },
                 {
                     "platform": "mac",
                     "shortcut": "Meta+0 Meta+Numpad0"
                 }
             ]
         },
         {
-            "type": "@WebInspector.ActionDelegate",
-            "actionId": "main.toggle-device-mode",
-            "className": "WebInspector.AdvancedApp.ToggleDeviceModeActionDelegate",
-            "condition": "can_dock",
-            "bindings": [
-                {
-                    "platform": "windows,linux",
-                    "shortcut": "Shift+Ctrl+M"
-                },
-                {
-                    "platform": "mac",
-                    "shortcut": "Shift+Meta+M"
-                }
-            ]
-        },
-        {
             "type": "drawer-view",
             "name": "rendering",
             "title": "Rendering",
             "order": "11",
             "className": "WebInspector.RenderingOptions.View"
         },
         {
             "type": "@WebInspector.ToolbarItem.Provider",
             "className": "WebInspector.InspectElementModeController.ToggleButtonProvider",
             "location": "main-toolbar-left",
             "order": 0,
             "actionId": "main.toggle-element-search"
         },
         {
             "type": "@WebInspector.ToolbarItem.Provider",
-            "className": "WebInspector.AdvancedApp.EmulationButtonProvider",
-            "condition": "can_dock",
-            "order": 1,
-            "location": "main-toolbar-left"
-        },
-        {
-            "type": "@WebInspector.ToolbarItem.Provider",
             "className": "WebInspector.Main.WarningErrorCounter",
             "order": 1,
             "location": "main-toolbar-right"
         },
         {
             "type": "@WebInspector.ToolbarItem.Provider",
             "className": "WebInspector.InspectorView.ToggleDrawerButtonProvider",
             "order": 2,
             "location": "main-toolbar-right"
         },
@@ skipping 112 matching lines @@
         "Tests.js",
         "OverlayController.js",
         "Main.js"
     ],
     "skip_compilation": [
         "Tests.js"
     ],
     "resources": [
     ]
 }