Make fps NSInteger in startCaptureWithDevice.

webrtc/examples/objc/AppRTCMobile/ARDCaptureController.m

 /*
  *  Copyright 2017 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.
  */
 
@@ skipping 16 matching lines @@
   }
 
   return self;
 }
 
 - (void)startCapture {
   AVCaptureDevicePosition position =
       _usingFrontCamera ? AVCaptureDevicePositionFront : AVCaptureDevicePositionBack;
   AVCaptureDevice *device = [self findDeviceForPosition:position];
   AVCaptureDeviceFormat *format = [self selectFormatForDevice:device];
-  int fps = [self selectFpsForFormat:format];
+  NSInteger fps = [self selectFpsForFormat:format];
 
   [_capturer startCaptureWithDevice:device format:format fps:fps];
 }
 
 - (void)stopCapture {
   [_capturer stopCapture];
 }
 
 - (void)switchCamera {
   _usingFrontCamera = !_usingFrontCamera;
@@ skipping 26 matching lines @@
     if (diff < currentDiff) {
       selectedFormat = format;
       currentDiff = diff;
     }
   }
 
   NSAssert(selectedFormat != nil, @"No suitable capture format found.");
   return selectedFormat;
 }
 
-- (int)selectFpsForFormat:(AVCaptureDeviceFormat *)format {
+- (NSInteger)selectFpsForFormat:(AVCaptureDeviceFormat *)format {
   Float64 maxFramerate = 0;
   for (AVFrameRateRange *fpsRange in format.videoSupportedFrameRateRanges) {
     maxFramerate = fmax(maxFramerate, fpsRange.maxFrameRate);
   }
   return maxFramerate;
 }
 
 @end