webrtc: Remove semicolons.

Bug: chromium:926235
Change-Id: I66c10ab3df38adf87152d1f18cc8162afedca7e4
Reviewed-on: https://webrtc-review.googlesource.com/c/123560
Commit-Queue: Tommi <tommi@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26780}
diff --git a/system_wrappers/source/clock.cc b/system_wrappers/source/clock.cc
index a0acf40..f69d13c 100644
--- a/system_wrappers/source/clock.cc
+++ b/system_wrappers/source/clock.cc
@@ -271,4 +271,4 @@
   time_us_ += microseconds;
 }
 
-};  // namespace webrtc
+}  // namespace webrtc