Restore Function()'s expected string representation.

R=rossberg@chromium.org
BUG=v8:2470
TEST=mjsunit/regress/regress-2470

Review URL: https://codereview.chromium.org/12687002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@13880 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/v8natives.js

@@ -1710,7 +1710,7 @@ function NewFunction(arg1) {  // length == 1
     p += '\n/' + '**/';
   }
   var body = (n > 0) ? ToString(%_Arguments(n - 1)) : '';
-  var source = '(function(\n' + p + '\n) {\n' + body + '\n})';
+  var source = '(function(' + p + ') {\n' + body + '\n})';
 
   // The call to SetNewFunctionAttributes will ensure the prototype
   // property of the resulting function is enumerable (ECMA262, 15.3.5.2).

test/mjsunit/regress/regress-2470.js

@@ -40,3 +40,8 @@ assertThrows('Function("a", "/*", "*/", "/**/");', SyntaxError);
 assertDoesNotThrow('Function("//", "//")');
 assertDoesNotThrow('Function("//", "//", "//")');
 assertThrows('Function("a", "//", "//")', SyntaxError);
+
+// Some embedders rely on the string representation of the resulting
+// function in cases where no formal parameters are specified.
+var asString = Function("return 23").toString();
+assertSame("function anonymous() {\nreturn 23\n}", asString);