trace: remove internal Google reference from comment

Change-Id: I74ca09e4f4765c1c8d309b8fe1ce25b5e3d8171f
Reviewed-on: https://go-review.googlesource.com/33270
Reviewed-by: Ian Lance Taylor <iant@golang.org>
diff --git a/trace/trace.go b/trace/trace.go
index 1826586..ecd766e 100644
--- a/trace/trace.go
+++ b/trace/trace.go
@@ -752,7 +752,7 @@
 		and very unlikely to be the fault of this code.
 
 		The most likely scenario is that some code elsewhere is using
-		a requestz.Trace after its Finish method is called.
+		a trace.Trace after its Finish method is called.
 		You can temporarily set the DebugUseAfterFinish var
 		to help discover where that is; do not leave that var set,
 		since it makes this package much less efficient.