Core: Remove special case try/catch in isPlainObject

Fixes #14746

Author: rwaldron

src/core.js

@@ -225,16 +225,8 @@ jQuery.extend({
 			return false;
 		}
 
-		// Support: Firefox <20
-		// The try/catch suppresses exceptions thrown when attempting to access
-		// the "constructor" property of certain host objects, ie. |window.location|
-		// https://bugzilla.mozilla.org/show_bug.cgi?id=814622
-		try {
-			if ( obj.constructor &&
-					!hasOwn.call( obj.constructor.prototype, "isPrototypeOf" ) ) {
-				return false;
-			}
-		} catch ( e ) {
+		if ( obj.constructor &&
+				!hasOwn.call( obj.constructor.prototype, "isPrototypeOf" ) ) {
 			return false;
 		}