Update documentation for base::ResetAndReturn(Callback*)

base/callback_helpers.h

Index: base/callback_helpers.h
diff --git a/base/callback_helpers.h b/base/callback_helpers.h
index ec3d6cbf168140766f710527a297c7b44a03efce..6e0aee88822d85cee8d5481241ac26741629d9b3 100644
--- a/base/callback_helpers.h
+++ b/base/callback_helpers.h
@@ -8,8 +8,8 @@
 // generated).  Instead, consider adding methods here.
 //
 // ResetAndReturn(&cb) is like cb.Reset() but allows executing a callback (via a
-// copy) after the original callback is Reset().  This can be handy if Run()
-// reads/writes the variable holding the Callback.
+// move or copy) after the original callback is Reset().  This can be handy if

[michaelpg, 2017/03/17 03:55:00]

I think it's normally a move, since its return value will be treated as an
rvalue reference to a temporary (or elided); if it was always a copy, it
wouldn't work with OnceCallback.

+// Run() reads/writes the variable holding the Callback.
 
 #ifndef BASE_CALLBACK_HELPERS_H_
 #define BASE_CALLBACK_HELPERS_H_