Fix chromium warnings for SdpVideoFormat.

Bug: webrtc:163
Change-Id: I29ad3c00116692f047456df7721ba636bbb2ca89
Reviewed-on: https://webrtc-review.googlesource.com/64723
Commit-Queue: Niels Moller <nisse@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22618}
diff --git a/modules/video_coding/codec_timer.cc b/modules/video_coding/codec_timer.cc
index 5a9b6e4..725f025 100644
--- a/modules/video_coding/codec_timer.cc
+++ b/modules/video_coding/codec_timer.cc
@@ -25,6 +25,7 @@
 
 VCMCodecTimer::VCMCodecTimer()
     : ignored_sample_count_(0), filter_(kPercentile) {}
+VCMCodecTimer::~VCMCodecTimer() = default;
 
 void VCMCodecTimer::AddTiming(int64_t decode_time_ms, int64_t now_ms) {
   // Ignore the first |kIgnoredSampleCount| samples.