Add heapcheck suppression for NSS trust leak.

tools/heapcheck/suppressions.txt

 # There are three kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or 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 (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 83 matching lines @@
 }
 {
    bug_51988_c
    Heapcheck:Leak
    ...
    fun:base::::NSSInitSingleton::OpenUserDB
    fun:base::::NSSInitSingleton::OpenTestNSSDB
    fun:base::OpenTestNSSDB
    fun:net::CertDatabaseNSSTest::SetUp
 }
-
+{
+   bug_66941_a
+   Heapcheck:Leak
+   fun:PR_NewLock

[wtc, 2010/12/17 02:46:59]

The suppressions should all include CERT_ChangeCertTrust
in the call stacks.

In fact, I think it's fine to merge these into a single
suppression with this call stack:
  fun:CERT_ChangeCertTrust
  fun:net::TestRootCerts::*

[Ryan Sleevi, 2010/12/17 02:50:17]

wtc: Unfortunately, heapcheck wasn't picking up CERT_ChangeCertTrust as part of
the callstack. The suppressions went straight from Add/Clear into these three
functions. Otherwise, I would have just suppressed CERT_ChangeCertTrust without
the TestRootCerts, which is what I did for the Valgrind suppression.

+   fun:net::TestRootCerts::*
+}
+{
+   bug_66941_b
+   Heapcheck:Leak
+   fun:nss_ZAlloc
+   fun:net::TestRootCerts::*
+}
+{
+   bug_66941_c
+   Heapcheck:Leak
+   fun:PL_ArenaAllocate
+   fun:net::TestRootCerts::*
+}
+   
 #-----------------------------------------------------------------------
 # 2. intentional unit test errors, or stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing
 {
    Heapcheck sanity test (ToolsSanityTest.MemoryLeak).
    Heapcheck:Leak
    fun:ToolsSanityTest_MemoryLeak_Test::TestBody
 }
 {
    Intentional leak in BrowserThreadTest.NotReleasedIfTargetThreadNonExistent
@@ skipping 1008 matching lines @@
    Heapcheck:Leak
    ...
    fun:MalwareDetailsTest_*
 }
 {
    bug_66808
    Heapcheck:Leak
    ...
    fun:remoting::HeartbeatSenderTest_ProcessResponse_Test::TestBody
 }