Fix compile error in iossim.

testing/iossim/iossim.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Foundation/Foundation.h>
 #include <asl.h>
 #include <libgen.h>
 #include <stdarg.h>
 #include <stdio.h>
 
@@ skipping 194 matching lines @@
        didStart:(BOOL)started
       withError:(NSError*)error {
   if (!started) {
     // If the test executes very quickly (<30ms), the SimulatorDelegate may not
     // get the initial session:started:withError: message indicating successful
     // startup of the simulated app. Instead the delegate will get a
     // session:started:withError: message after the timeout has elapsed. To
     // account for this case, check if the simulated app's stdio file was
     // ever created and if it exists dump it to stdout and return success.
     NSFileManager* fileManager = [NSFileManager defaultManager];
-    if ([fileManager fileExistsAtPath:stdioPath_ isDirectory:NO]) {
+    if ([fileManager fileExistsAtPath:stdioPath_]) {
       appRunning_ = NO;
       [self tailOutput];
       // Note that exiting in this state leaves a process running
       // (e.g. /.../iPhoneSimulator4.3.sdk/usr/libexec/installd -t 30) that will
       // prevent future simulator sessions from being started for 30 seconds
       // unless the iOS Simulator application is killed altogether.
       [self session:session didEndWithError:nil];
 
       // session:didEndWithError should not return (because it exits) so
       // the execution path should never get here.
@@ skipping 461 matching lines @@
              [error localizedDescription],
              [error domain], static_cast<long int>([error code]));
   }
 
   // Note that this code is only executed if the simulator fails to start
   // because once the main run loop is started, only the delegate calling
   // exit() will end the program.
   [pool drain];
   return EXIT_FAILURE;
 }