Experimental UI: don't show dates for no-build commands

    When building with timestamps enabled, it is useful to know the date
    as well, e.g., when later looking at logs. This, however, is not the
    case if the command does not build (e.g., "bazel help", "bazel query"),
    or, in general, if the first output is only produced after the command
    is completed.

    Change-Id: I75ef38fbb98e886b1dc38899efa10188055f87e2
    PiperOrigin-RevId: 157700578

dataset/GitHub_Java/bazelbuild.bazel/src/main/java/com/google/devtools/build/lib/runtime/ExperimentalEventHandler.java

@@ -147,16 +147,6 @@ public void write(int b) throws IOException {
         stream.write(b);
       }
     }
-
-    @Override
-    public void flush() throws IOException {
-      stream.flush();
-    }
-
-    @Override
-    public void close() throws IOException {
-      stream.close();
-    }
   }
 
   public ExperimentalEventHandler(