Merge pull request microsoft#620 from saschanaz/deprecated-event

Mark window.event as deprecated

Author: sandersn

baselines/dom.generated.d.ts

@@ -16505,6 +16505,7 @@ interface Window extends EventTarget, WindowTimers, WindowSessionStorage, Window
     readonly devicePixelRatio: number;
     readonly doNotTrack: string;
     readonly document: Document;
+    /** @deprecated */
     readonly event: Event | undefined;
     /** @deprecated */
     readonly external: External;
@@ -17369,6 +17370,7 @@ declare var defaultStatus: string;
 declare var devicePixelRatio: number;
 declare var doNotTrack: string;
 declare var document: Document;
+/** @deprecated */
 declare var event: Event | undefined;
 /** @deprecated */
 declare var external: External;

inputfiles/overridingTypes.json

@@ -423,7 +423,8 @@
                     "property": {
                         "event": {
                             "name": "event",
-                            "override-type": "Event | undefined"
+                            "override-type": "Event | undefined",
+                            "deprecated": 1
                         },
                         "orientation": {
                             "name": "orientation",