Add one more suppression for [false?] memory leak reports in std::string

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
===================================================================
--- tools/valgrind/memcheck/suppressions.txt	(revision 96926)
+++ tools/valgrind/memcheck/suppressions.txt	(working copy)
@@ -640,6 +640,14 @@
    fun:_ZNSs4_Rep9_S_createE*RKSaIcE
    fun:_ZNSs9_M_mutateEjjj
 }
+{
+   bug_76386d
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZNSs4_Rep9_S_createEjjRKSaIcE
+   ...
+   fun:_ZNSsC1ERKSsjj
+}
 
 #-----------------------------------------------------------------------
 # 2. intentional unit test errors, or stuff that is somehow a false positive
@@ -5206,26 +5214,6 @@
    fun:_ZN4base6subtle18TaskClosureAdapter3RunEv
 }
 {
-   bug_92548
-   Memcheck:Leak
-   fun:_Znw*
-   ...
-   fun:_ZNSsC1ERKSsjj
-   fun:_ZNK4GURL15ComponentStringERKN9url_parse9ComponentE
-   fun:_ZNK4GURL4pathEv
-   fun:_ZN3net8HttpUtil14PathForRequestERK4GURL
-   fun:_ZN3net15HttpBasicStream11SendRequestERKNS_18HttpRequestHeadersEPNS_16UploadDataStreamEPNS_16HttpResponseInfoEP14CallbackRunnerI6Tuple1IiEE
-   fun:_ZN3net22HttpNetworkTransaction13DoSendRequestEv
-   fun:_ZN3net22HttpNetworkTransaction6DoLoopEi
-   fun:_ZN3net22HttpNetworkTransaction12OnIOCompleteEi
-   fun:_ZN3net22HttpNetworkTransaction13OnStreamReadyERKNS_9SSLConfigERKNS_9ProxyInfoEPNS_10HttpStreamE
-   fun:_ZN3net21HttpStreamFactoryImpl7Request13OnStreamReadyEPNS0_3JobERKNS_9SSLConfigERKNS_9ProxyInfoEPNS_10HttpStreamE
-   fun:_ZN3net21HttpStreamFactoryImpl3Job21OnStreamReadyCallbackEv
-   fun:_Z16DispatchToMethodIN3net21HttpStreamFactoryImpl3JobEMS2_FvvEEvPT_T0_RK6Tuple0
-   fun:_ZN27ScopedRunnableMethodFactoryIN3net21HttpStreamFactoryImpl3JobEE14RunnableMethodIMS2_FvvE6Tuple0E3RunEv
-   fun:_ZN4base6subtle18TaskClosureAdapter3RunEv
-}
-{
    bug_92571
    Memcheck:Leak
    fun:_Znw*