Valgrind: Remove obsolete WebSharedWorkerStub suppression.

tools/valgrind/memcheck/suppressions.txt

 # There are four 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 # running overnight and removing outdated bugs/suppressions.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 676 matching lines @@
    bug_19775_h
    Memcheck:Leak
    ...
    fun:malloc
    fun:sqlite3MemMalloc
    fun:mallocWithAlarm
    fun:sqlite3Malloc
    ...
    fun:yy_reduce
 }
-# The following three suppressions are related to the workers code.

[falken, 2016/07/11 04:18:23]

This comment is stale also.

-{
-   bug_27837
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN19WebSharedWorkerStub9OnConnectEii
-}
 {
    bug_32085
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN9__gnu_cxx13new_allocatorIN7content21NotificationRegistrar6RecordEE8allocate*
    fun:_ZNSt12_Vector_baseIN7content21NotificationRegistrar6RecordESaIS*
    fun:_ZNSt6vectorIN7content21NotificationRegistrar6RecordESaIS2_EE13_M_insert_auxEN9__gnu_cxx17__normal_iteratorIPS2_S*
    fun:_ZNSt6vectorIN7content21NotificationRegistrar6RecordESaIS*
    fun:_ZN7content21NotificationRegistrar3Add*
 }
@@ skipping 2272 matching lines @@
 {
    bug_602964
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN4base4BindIMNS_12_GLOBAL__N_121PostTaskAndReplyRelayEFvvEJNS_8internal17UnretainedWrapper*
    fun:_ZN4base8internal20PostTaskAndReplyImpl16PostTaskAndReplyERKN15tracked_objects8LocationERKNS*
    fun:_ZN4base10TaskRunner16PostTaskAndReplyERKN15tracked_objects8LocationERKNS_8CallbackIFvvELNS*
    fun:_ZN4base26PostTaskAndReplyWithResultIN3net20WifiPHYLayerProtocolES2_EEbPNS*
    fun:_ZN7metrics22NetworkMetricsProvider25ProbeWifiPHYLayerProtocolEv
 }