Make the default severity level of RTCCallbackLogger match the comment on its header.

The comment here said it is kRTCLoggingSeverityInfo

https://cs.chromium.org/chromium/src/third_party/webrtc/sdk/objc/Framework/Headers/WebRTC/RTCCallbackLogger.h?type=cs&q=RTCCallbacklogger&sq=package:chromium&g=0&l=23

Which is not true since objective c auto initailize all member to 0, the severity level will be verbose.


Bug: webrtc:9509
Change-Id: I894e2d8df33bf12bdf041cdee9e6dd3adef7fb12
Reviewed-on: https://webrtc-review.googlesource.com/87800
Reviewed-by: Anders Carlsson <andersc@webrtc.org>
Commit-Queue: Kári Helgason <kthelgason@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23898}

sdk/objc/Framework/Classes/Common/RTCCallbackLogger.mm

@@ -41,6 +41,14 @@ class CallbackLogSink : public rtc::LogSink {
 
 @synthesize severity = _severity;
 
+- (instancetype)init {
+  self = [super init];
+  if (self != nil) {
+    _severity = RTCLoggingSeverityInfo;
+  }
+  return self;
+}
+
 - (void)dealloc {
   [self stop];
 }