Add a TODO comment to remind us when we will be able to remove the

tools/valgrind/memcheck/suppressions_linux.txt

+# There are three kinds of suppressions in this file:
+# 1. Third party stuff we have no control over.
+#
+# 2. Intentional unit test errors, stuff that is somehow a false positive
+# in our own code, or stuff that is so trivial it's not worth fixing.
+#
+# 3. Suppressions for real chromium bugs that are not yet fixed.
+# These should all be in chromium's bug tracking system.
+# Periodically we should sweep this file and the bug tracker clean by
+# running overnight and removing outdated bugs/suppressions.
+#-----------------------------------------------------------------------
+
+# 1. Third party stuff we have no control over.
+{
+   # The InvalidRead error in rc4_wordconv is intentional.

[wtc, 2013/02/19 19:35:55]

This suppression was in Section 2 of suppressions.txt
because it is an intentional invalid read. I put it in
Section 1 of this file because this is in third-party code
(system NSS libraries).

+   # https://bugzilla.mozilla.org/show_bug.cgi?id=341127
+   # TODO(wtc): This invalid read has been fixed in NSS 3.14.4.  Remove this
+   # suppression when the system NSS libraries in Linux distributions are
+   # version 3.14.4 or later.
+   bug_43113 (Intentional)
+   Memcheck:Unaddressable
+   fun:rc4_wordconv
+   fun:RC4_Encrypt
+}
+
+# 2. Intentional unit test errors, stuff that is somehow a false positive
+# in our own code, or stuff that is so trivial it's not worth fixing.
+
+# 3. Suppressions for real chromium bugs that are not yet fixed.