Fix some warnings in ObjC code.

webrtc/api/objc/RTCIceCandidate.mm

 /*
  *  Copyright 2015 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.
  */
 
 #import "RTCIceCandidate.h"
 
 #import "webrtc/api/objc/RTCIceCandidate+Private.h"
 #import "webrtc/base/objc/NSString+StdString.h"
 #import "webrtc/base/objc/RTCLogging.h"
 
 @implementation RTCIceCandidate
 
 @synthesize sdpMid = _sdpMid;
 @synthesize sdpMLineIndex = _sdpMLineIndex;
 @synthesize sdp = _sdp;
 
 - (instancetype)initWithSdp:(NSString *)sdp
-              sdpMLineIndex:(NSInteger)sdpMLineIndex
+              sdpMLineIndex:(int)sdpMLineIndex
                      sdpMid:(NSString *)sdpMid {
   NSParameterAssert(sdp.length);
   if (self = [super init]) {
     _sdpMid = [sdpMid copy];
     _sdpMLineIndex = sdpMLineIndex;
     _sdp = [sdp copy];
   }
   return self;
 }
 
 - (NSString *)description {
-  return [NSString stringWithFormat:@"RTCIceCandidate:\n%@\n%ld\n%@",
+  return [NSString stringWithFormat:@"RTCIceCandidate:\n%@\n%d\n%@",
                                     _sdpMid,
-                                    (long)_sdpMLineIndex,
+                                    _sdpMLineIndex,
                                     _sdp];
 }
 
 #pragma mark - Private
 
 - (instancetype)initWithNativeCandidate:
     (const webrtc::IceCandidateInterface *)candidate {
   NSParameterAssert(candidate);
   std::string sdp;
   candidate->ToString(&sdp);
@@ skipping 12 matching lines @@
   if (!candidate) {
     RTCLog(@"Failed to create ICE candidate: %s\nline: %s",
            error.description.c_str(),
            error.line.c_str());
   }
 
   return rtc::scoped_ptr<webrtc::IceCandidateInterface>(candidate);
 }
 
 @end