Revert valgrind suppression for bug 89300

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 # running overnight and removing outdated bugs/suppressions.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 4232 matching lines @@
 }
 {
    bug_81796
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN4base16MessageLoopProxy22currentEv
    fun:_ZN3IPC12ChannelProxy7ContextC1EPNS_7Channel8ListenerEPN4base16MessageLoopProxyE
    fun:_ZN3IPC12ChannelProxyC1ERKNS_13ChannelHandleENS_7Channel4ModeEPNS4_8ListenerEPN4base16MessageLoopProxyE
 }
 {
-   bug_89300
-   Memcheck:Leak
-   fun:_Znw*
-   ...
-   fun:_ZN8IOThread31RegisterURLRequestContextGetterEP29ChromeURLRequestContextGetter
-   fun:_ZN29ChromeURLRequestContextGetter20GetURLRequestContextEv
-   fun:_ZL23AddDataSourceOnIOThread13scoped_refptrIN3net23URLRequestContextGetterEES_IN20ChromeURLDataManager10DataSourceEE
-}
-{
    bug_89304
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN3net20ClientSocketPoolBaseINS_*SocketParamsEE13RequestSocketERKSsRK13scoped_refptrIS1_ENS_15RequestPriorityEPNS_18ClientSocketHandleEP14CallbackRunnerI6Tuple1IiEERKNS_11BoundNetLogE
    fun:_ZN3net*SocketPool13RequestSocketERKSsPKvNS_15RequestPriorityEPNS_18ClientSocketHandleEP14CallbackRunnerI6Tuple1IiEERKNS_11BoundNetLogE
    fun:_ZN3net18ClientSocketHandle4Init*
    ...
    fun:_ZN3net23ClientSocketPoolManager30InitSocketHandleForHttpRequestERK4GURLRKNS_18HttpRequestHeadersEiNS_15RequestPriorityEPNS_18HttpNetworkSessionERKNS_9ProxyInfoEbbRKNS_9SSLConfigESF_RKNS_11BoundNetLogEPNS_18ClientSocketHandleEP14CallbackRunnerI6Tuple1IiEE
    fun:_ZN3net21HttpStreamFactoryImpl3Job16DoInitConnectionEv
@@ skipping 786 matching lines @@
 }
 {
    bug_todo_getdelim2
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }