Widen Valgrind suppressions

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
===================================================================
--- tools/valgrind/memcheck/suppressions.txt	(revision 96752)
+++ tools/valgrind/memcheck/suppressions.txt	(working copy)
@@ -633,6 +633,13 @@
    fun:_ZNSs4_Rep9_S_createE*RKSaIcE
    fun:_ZNSs4_Rep8_M_cloneERKSaIcE*
 }
+{
+   bug_76386c
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZNSs4_Rep9_S_createE*RKSaIcE
+   fun:_ZNSs9_M_mutateEjjj
+}
 
 #-----------------------------------------------------------------------
 # 2. intentional unit test errors, or stuff that is somehow a false positive
@@ -877,7 +884,7 @@
 {
    bug_87500_a
    Memcheck:Leak
-   fun:_Znw*
+   fun:_Zn*
    ...
    fun:_ZN10disk_cache9BackendIO23ExecuteBackendOperationEv
    fun:_ZN10disk_cache9BackendIO16ExecuteOperationEv
@@ -5215,18 +5222,6 @@
    fun:_ZN4base6subtle18TaskClosureAdapter3RunEv
 }
 {
-   bug_92554
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZNSs4_Rep9_S_createEjjRKSaIcE
-   fun:_ZNSs9_M_mutateEjjj
-   fun:_ZNSs12_M_leak_hardEv
-   fun:_ZNSsixEj
-   fun:_ZN3net13TrimEndingDotERKSs
-   fun:_ZN3net20GetHostOrSpecFromURLERK4GURL
-   fun:_ZN20AsyncResourceHandler17OnResponseStartedEiP16ResourceResponse
-}
-{
    bug_92571
    Memcheck:Leak
    fun:_Znw*