webrtc/base: Use RTC_DCHECK() instead of assert()

webrtc/base/maccocoathreadhelper.mm

 /*
  *  Copyright 2007 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 // Helper function for using Cocoa with Posix threading.
 
-#import <assert.h>
 #import <Foundation/Foundation.h>
 
 #import "webrtc/base/maccocoathreadhelper.h"
 
+#include "webrtc/base/checks.h"
+
 namespace rtc {
 
 // Cocoa must be "put into multithreading mode" before Cocoa functionality can
 // be used on POSIX threads. The way to do that is to spawn one thread that may
 // immediately exit.
 void InitCocoaMultiThreading() {
   if ([NSThread isMultiThreaded] == NO) {
     // The sole purpose of this autorelease pool is to avoid a console
     // message on Leopard that tells us we're autoreleasing the thread
     // with no autorelease pool in place.
     // Doing NSAutoreleasePool* hack = [[NSAutoreleasePool alloc] init];
     // causes unused variable error.
     NSAutoreleasePool* hack;
     hack = [[NSAutoreleasePool alloc] init];
     [NSThread detachNewThreadSelector:@selector(class)
                              toTarget:[NSObject class]
                            withObject:nil];
     [hack drain];
   }
 
-  assert([NSThread isMultiThreaded]);
+  RTC_DCHECK([NSThread isMultiThreaded]);
 }
 
 }  // namespace rtc