Don't initialize NSS before calling SSL_ClearSessionCache.

tools/valgrind/memcheck/suppressions_mac.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 # running overnight and removing outdated bugs/suppressions.
@@ skipping 1724 matching lines @@
    fun:update_context_from_thread
    fun:frame_thread_free
    fun:avcodec_close
    ...
    fun:_ZN5media23FFmpegVideoDecodeEngineD0Ev
    fun:_ZN10scoped_ptrIN5media23FFmpegVideoDecodeEngineEE5resetEPS1_
    fun:_ZN5media27FFmpegVideoDecodeEngineTestD2Ev
    fun:_ZN5media51FFmpegVideoDecodeEngineTest_DecodeFrame_Normal_TestD0Ev
 }
 {
-   bug_95718_b
-   Memcheck:Leak
-   fun:calloc
-   fun:PR_NewLock
-   fun:ssl_Init*
-   fun:InitSessionCacheLocks
-   fun:initSessionCacheLocksLazily
-   fun:PR_CallOnce
-   fun:ssl_InitSessionCacheLocks
-   fun:lock_cache
-   fun:SSL_ClearSessionCache
-}
-{
    bug_96300
    Memcheck:Leak
    ...
    fun:_ZN8Security12KeychainCore5Trust8evaluate*
    fun:SecTrustEvaluate
    fun:_ZNK3net15X509Certificate14VerifyInternalERKSsiPNS_16CertVerifyResultE
    fun:_ZNK3net15X509Certificate6VerifyERKSsiPNS_16CertVerifyResultE
 }
 {
    bug_96559a
@@ skipping 460 matching lines @@
    fun:_ZN2v88internalL6InvokeEbNS0_6HandleINS0_10JSFunctionEEENS1_INS0_6ObjectEEEiPS5_Pb
    fun:_ZN2v88internal9Execution4CallENS0_6HandleINS0_6ObjectEEES4_iPS4_Pbb
    fun:_ZN2v88Function4CallENS_6HandleINS_6ObjectEEEiPNS1_INS_5ValueEEE
    fun:_ZN7WebCore7V8Proxy24instrumentedCallFunctionEPNS_4PageEN2v86HandleINS3_8FunctionEEENS4_INS3_6ObjectEEEiPNS4_INS3_5ValueEEE
    fun:_ZN7WebCore7V8Proxy12callFunctionEN2v86HandleINS1_8FunctionEEENS2_INS1_6ObjectEEEiPNS2_INS1_5ValueEEE
    fun:_ZN7WebCore19V8LazyEventListener20callListenerFunctionEPNS_22ScriptExecutionContextEN2v86HandleINS3_5ValueEEEPNS_5EventE
    fun:_ZN7WebCore23V8AbstractEventListener18invokeEventHandlerEPNS_22ScriptExecutionContextEPNS_5EventEN2v86HandleINS5_5ValueEEE
    fun:_ZN7WebCore23V8AbstractEventListener11handleEventEPNS_22ScriptExecutionContextEPNS_5EventE
    fun:_ZN7WebCore11EventTarget18fireEventListenersEPNS_5EventEPNS_15EventTargetDataERN3WTF6VectorINS_23RegisteredEventListenerELm1EEE
 }