Remove compat for iOS 7/8

webrtc/modules/video_capture/ios/rtc_video_capture_ios_objc.mm

Index: webrtc/modules/video_capture/ios/rtc_video_capture_ios_objc.mm
diff --git a/webrtc/modules/video_capture/ios/rtc_video_capture_ios_objc.mm b/webrtc/modules/video_capture/ios/rtc_video_capture_ios_objc.mm
index e36c83bad9485517b69f9acea5ab5fde74ba3b0e..73d14c9749b3d1f65faf96cf07d81bf46759e4fb 100644
--- a/webrtc/modules/video_capture/ios/rtc_video_capture_ios_objc.mm
+++ b/webrtc/modules/video_capture/ios/rtc_video_capture_ios_objc.mm
@@ -44,12 +44,6 @@ using namespace webrtc::videocapturemodule;
     _owner = owner;
     _captureId = captureId;
     _captureSession = [[AVCaptureSession alloc] init];
-#if defined(__IPHONE_7_0) && __IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_7_0

[magjed_webrtc, 2016/09/29 11:39:58]

It looks like the purpose of this check was to execute the code when the iPhone
OS version >= 7. So remove the check but not the code? If this is untested code,
probably best to speak with henrika@ first.

-    NSString* version = [[UIDevice currentDevice] systemVersion];
-    if ([version integerValue] >= 7) {
-      _captureSession.usesApplicationAudioSession = NO;
-    }
-#endif
     _captureChanging = NO;
     _captureChangingCondition = [[NSCondition alloc] init];