revert fix for generated files

Author: Salasar

lib/lib.es2015.core.d.ts

@@ -37,7 +37,7 @@ interface Array<T> {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: T, index: number, obj: Array<T>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: T) => boolean, thisArg?: any): number;
 
     /**
       * Returns the this object after filling the section identified by start and end with value

lib/lib.es6.d.ts

@@ -4143,7 +4143,7 @@ interface Array<T> {
       * @param thisArg If provided, it will be used as the this value for each invocation of
       * predicate. If it is not provided, undefined is used instead.
       */
-    findIndex(predicate: (value: T, index: number, obj: Array<T>) => boolean, thisArg?: any): number;
+    findIndex(predicate: (value: T) => boolean, thisArg?: any): number;
 
     /**
       * Returns the this object after filling the section identified by start and end with value