Removed file RTCCameraVideoCapturer.mm that isn't needed

webrtc/sdk/objc/Framework/Classes/Video/AVCaptureSession+DevicePosition.mm

 /*
  *  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.
  */
 
-#import "AVCaptureSession+Device.h"
+#import "AVCaptureSession+DevicePosition.h"
 
 BOOL CFStringContainsString(CFStringRef theString, CFStringRef stringToFind) {
   return CFStringFindWithOptions(theString,
                                  stringToFind,
                                  CFRangeMake(0, CFStringGetLength(theString)),
                                  kCFCompareCaseInsensitive,
                                  nil);
 }
 
-@implementation AVCaptureSession (Device)
+@implementation AVCaptureSession (DevicePosition)
 
 + (AVCaptureDevicePosition)devicePositionForSampleBuffer:(CMSampleBufferRef)sampleBuffer {
   // Check the image's EXIF for the camera the image came from.
   AVCaptureDevicePosition cameraPosition = AVCaptureDevicePositionUnspecified;
   CFDictionaryRef attachments = CMCopyDictionaryOfAttachments(
       kCFAllocatorDefault, sampleBuffer, kCMAttachmentMode_ShouldPropagate);
   if (attachments) {
     int size = CFDictionaryGetCount(attachments);
     if (size > 0) {
       CFDictionaryRef cfExifDictVal = nil;
@@ skipping 10 matching lines @@
           }
         }
       }
     }
     CFRelease(attachments);
   }
   return cameraPosition;
 }
 
 @end