Correct iOS build for latest Xcode beta.

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.
 
 #include <asl.h>
 #import <Foundation/Foundation.h>
 #include <libgen.h>
 #include <stdarg.h>
 #include <stdio.h>
 
@@ skipping 14 matching lines @@
 // (crbug.com/385030).
 #if defined(IOSSIM_USE_XCODE_6)
 @class DVTStackBacktrace;
 #import "DVTFoundation.h"
 #endif  // IOSSIM_USE_XCODE_6
 
 // TODO(lliabraa): Once all builders are on Xcode 6 this ifdef can be removed
 // (crbug.com/385030).
 #if defined(IOSSIM_USE_XCODE_6)
 @protocol SimBridge;
+@class DVTSimulatorApplication;
 @class SimDeviceSet;
 @class SimDeviceType;
 @class SimRuntime;
 @class SimServiceConnectionManager;
 #import "CoreSimulator.h"
 #endif  // IOSSIM_USE_XCODE_6
 
 @interface DVTPlatform : NSObject
 + (BOOL)loadAllPlatformsReturningError:(id*)arg1;
 @end
@@ skipping 971 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 kExitFailure;
 }