services/audio: Add missing semicolons to TRACE_EVENTs

Chrome is about to switch to the TRACE_EVENT macro implementation
provided by Perfetto. The new implementation requires trace event
statements to be terminated by semicolons, so this patch modifies the
codebase to add semicolons where they were previously left out.

No functional changes.

TBR=olka@chromium.org

Bug: 1006541
Change-Id: If614c8e30a439956f7986af1d822683c70716247
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627525Reviewed-by: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Commit-Queue: Olga Sharonova <olka@chromium.org>
Auto-Submit: Sami Kyöstilä <skyostil@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844510}

services/audio/service.cc

@@ -49,7 +49,7 @@ Service::Service(std::unique_ptr<AudioManagerAccessor> audio_manager_accessor,
     // created. This is required for in-process device notifications.
     InitializeDeviceMonitor();
   }
-  TRACE_EVENT0("audio", "audio::Service::OnStart")
+  TRACE_EVENT0("audio", "audio::Service::OnStart");
 
   // This will pre-create AudioManager if AudioManagerAccessor owns it.
   CHECK(audio_manager_accessor_->GetAudioManager());