Revert "added js.lib.Object.isSame; deprecated js.lib.Object.is (#2976)"

This reverts commit 3ba716717c3839243cc816c6cdc7fb44f6fd830f.

std/js/lib/Object.hx

@@ -99,17 +99,8 @@ extern class Object {
 		(which differs from both Abstract Equality Comparison and
 		Strict Equality Comparison).
 	**/
-	@:deprecated('js.lib.Object.is is deprecated. Use js.lib.Object.isSame instead.')
 	@:pure static function is<T>(value1:T, value2:T):Bool;
 
-	/**
-		Compares if two values are the same value. Equates all NaN values
-		(which differs from both Abstract Equality Comparison and
-		Strict Equality Comparison).
-	**/
-	@:native('is')
-	@:pure static function isSame<T>(value1:T, value2:T):Bool;
-
 	/**
 		Determines if extending of an object is allowed.
 	**/