Deprecate LogCB in favor of using MediaLog

media/base/media_log.h

Index: media/base/media_log.h
diff --git a/media/base/media_log.h b/media/base/media_log.h
index 5394fff3963300a052d6726139ee3216a4f09fe0..1e4b9464dd761a6deecf1616eaeabcec3ed6d38b 100644
--- a/media/base/media_log.h
+++ b/media/base/media_log.h
@@ -81,15 +81,9 @@ class MEDIA_EXPORT MediaLog : public base::RefCountedThreadSafe<MediaLog> {
   DISALLOW_COPY_AND_ASSIGN(MediaLog);
 };
 
-// Indicates a string should be added to the log.
-// First parameter - The log level for the string.
-// Second parameter - The string to add to the log.
-typedef base::Callback<void(MediaLog::MediaLogLevel, const std::string&)> LogCB;
-
-// Helper class to make it easier to use LogCB or MediaLog like DVLOG().
+// Helper class to make it easier to use MediaLog like DVLOG().
 class MEDIA_EXPORT LogHelper {
  public:
-  LogHelper(MediaLog::MediaLogLevel level, const LogCB& log_cb);
   LogHelper(MediaLog::MediaLogLevel level,
             const scoped_refptr<MediaLog>& media_log);
   ~LogHelper();
@@ -98,15 +92,14 @@ class MEDIA_EXPORT LogHelper {
 
  private:
   MediaLog::MediaLogLevel level_;
-  LogCB log_cb_;
   const scoped_refptr<MediaLog> media_log_;
   std::stringstream stream_;
 };
 
 // Provides a stringstream to collect a log entry to pass to the provided
-// logger (LogCB or MediaLog) at the requested level.
-#define MEDIA_LOG(level, logger) \
-  LogHelper((MediaLog::MEDIALOG_##level), (logger)).stream()
+// MediaLog at the requested level.
+#define MEDIA_LOG(level, media_log) \
+  LogHelper((MediaLog::MEDIALOG_##level), (media_log)).stream()
 
 // Logs only while |count| < |max|, increments |count| for each log, and warns
 // in the log if |count| has just reached |max|.
@@ -121,8 +114,8 @@ class MEDIA_EXPORT LogHelper {
 // |count| < |max| and |count|++ is 0.
 // TODO(wolenetz,chcunningham): Consider using a helper class instead of a macro
 // to improve readability.
-#define LIMITED_MEDIA_LOG(level, logger, count, max)                          \
-  LAZY_STREAM(MEDIA_LOG(level, logger),                                       \
+#define LIMITED_MEDIA_LOG(level, media_log, count, max)                       \
+  LAZY_STREAM(MEDIA_LOG(level, media_log),                                    \
               (count) < (max) && ((count)++ || true))                         \
       << (((count) == (max)) ? "(Log limit reached. Further similar entries " \
                                "may be suppressed): "                         \