Remove compat for iOS 7/8

webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm

Index: webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
diff --git a/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm b/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
index 115f7f847a5b291fddd3a61b582bb1222789c6b8..c71c9fdbd3d14eca8e3f1f60334a52aa9c66be85 100644
--- a/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
+++ b/webrtc/sdk/objc/Framework/Classes/avfoundationvideocapturer.mm
@@ -412,14 +412,9 @@ static NSString *GetSessionPresetForVideoFormat(
 
 - (BOOL)setupCaptureSession {
   AVCaptureSession *captureSession = [[AVCaptureSession alloc] init];
-#if defined(__IPHONE_7_0) && defined(__IPHONE_OS_VERSION_MAX_ALLOWED) \
-    && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_7_0
-  NSString *version = [[UIDevice currentDevice] systemVersion];
-  if ([version integerValue] >= 7) {
-    captureSession.usesApplicationAudioSession = NO;
-  }
+#if defined(WEBRTC_IOS)
+  captureSession.usesApplicationAudioSession = NO;
 #endif
-
   // Add the output.
   AVCaptureVideoDataOutput *videoDataOutput = [self videoDataOutput];
   if (![captureSession canAddOutput:videoDataOutput]) {