1b2469b878
When building the WebRTC project for iOS, the build will fail on Xcode 9 because of a missing framework-header (AVFoundation). This pull-request will add the missing "#import <AVFoundation/AVFoundation.h>" line to the "RTCCameraVideoCapturer" class. BUG=webrtc:7846 Review-Url: https://codereview.webrtc.org/2944753002 Cr-Commit-Position: refs/heads/master@{#18698}