minor fix, replace comman with semicolon

Bug: 
Change-Id: I4b7ffbe40e81c2e2f13feda4dae3437dbf07977b
Reviewed-on: https://chromium-review.googlesource.com/627390Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Fredrik Hubinette <hubbe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#496501}

content/renderer/media/renderer_webmediaplayer_delegate.cc

@@ -238,7 +238,8 @@ void RendererWebMediaPlayerDelegate::SetIdleCleanupParamsForTesting(
     base::TimeDelta idle_cleanup_interval,
     base::TickClock* tick_clock,
     bool is_jelly_bean) {
-  idle_cleanup_interval_ = idle_cleanup_interval, idle_timeout_ = idle_timeout;
+  idle_cleanup_interval_ = idle_cleanup_interval;
+  idle_timeout_ = idle_timeout;
   tick_clock_ = tick_clock;
   is_jelly_bean_ = is_jelly_bean;
 }