Explicitly #include <algorithm> in media/cast/logging/encoding_event_subscriber.cc

This is needed for std::sort.

I detected the issue when building against system protobuf-2.6.0.
Likely some header is no longer implicitly/indirectly #included.

BUG=none
R=miu@chromium.org

Review URL: https://codereview.chromium.org/528743002

Cr-Commit-Position: refs/heads/master@{#292903}

media/cast/logging/encoding_event_subscriber.cc

@@ -4,6 +4,7 @@
 
 #include "media/cast/logging/encoding_event_subscriber.h"
 
+#include <algorithm>
 #include <cstring>
 #include <utility>