Reduce MediaLog spam and add a note about unsupported statuses.

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 228611991658c365d77f0d663ce4339206d622c1..d927883cd01d66ac30e1bb331c87e6c4194455a1 100644
--- a/media/base/media_log.h
+++ b/media/base/media_log.h
@@ -70,10 +70,8 @@ class MEDIA_EXPORT MediaLog : public base::RefCountedThreadSafe<MediaLog> {
 
   // Report a property change without an accompanying event.
   void SetStringProperty(const std::string& key, const std::string& value);
-  void SetIntegerProperty(const std::string& key, int value);
   void SetDoubleProperty(const std::string& key, double value);
   void SetBooleanProperty(const std::string& key, bool value);
-  void SetTimeProperty(const std::string& key, base::TimeDelta value);
 
  protected:
   friend class base::RefCountedThreadSafe<MediaLog>;