Merge pull request #545 from Microsoft/Fix26083

Add index signature back to `Storage`

Author: mhegazy

baselines/dom.generated.d.ts

@@ -14333,6 +14333,7 @@ interface Storage {
      * storage[key] = value
      */
     setItem(key: string, value: string): void;
+    [name: string]: any;
 }
 
 declare var Storage: {

inputfiles/overridingTypes.json

@@ -1291,7 +1291,10 @@
                             ]
                         }
                     }
-                }
+                },
+                "override-index-signatures": [
+                    "[name: string]: any"
+                ]
             },
             "HTMLOptionsCollection": {
                 "name": "HTMLOptionsCollection",
@@ -2584,4 +2587,4 @@
     "typedefs": {
         "typedef": []
     }
-}
+}