Cast: Remove LoggingStats in favor of event subscribers.

media/cast/logging/logging_defines.h

Index: media/cast/logging/logging_defines.h
diff --git a/media/cast/logging/logging_defines.h b/media/cast/logging/logging_defines.h
index b4e18145f82d4be80435906887ec30a4c171968f..02eeec7828b52ddb0088c8e12f10d09c2cac2c99 100644
--- a/media/cast/logging/logging_defines.h
+++ b/media/cast/logging/logging_defines.h
@@ -18,22 +18,6 @@ static const uint32 kFrameIdUnknown = 0xFFFFFFFF;
 
 typedef uint32 RtpTimestamp;
 
-struct CastLoggingConfig {
-  // Constructs default config - all logging is disabled.
-  CastLoggingConfig();
-  ~CastLoggingConfig();
-
-  bool enable_raw_data_collection;
-  bool enable_stats_data_collection;
-};
-
-// Currently these are the same as the default config.
-CastLoggingConfig GetDefaultCastSenderLoggingConfig();
-CastLoggingConfig GetDefaultCastReceiverLoggingConfig();
-
-// Enable raw and stats data collection. Disable tracing.
-CastLoggingConfig GetLoggingConfigWithRawEventsAndStatsEnabled();
-
 enum CastLoggingEvent {
   // Generic events.
   kUnknown,