Fix leak in PrerenderResourceHandlerTest.

tools/valgrind/memcheck/suppressions.txt

 # There are three 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 # running overnight and removing outdated bugs/suppressions.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 3550 matching lines @@
    fun:_ZN3net17HttpStreamRequest7RunLoopEi
    fun:_ZN3net17HttpStreamRequest13StartInternalEPKNS_15HttpRequestInfoEPNS_9SSLConfigEPNS_9ProxyInfoERKNS_11BoundNetLogE
    fun:_ZN3net17HttpStreamRequest5StartEPKNS_15HttpRequestInfoEPNS_9SSLConfigEPNS_9ProxyInfoEPNS_13StreamRequest8DelegateERKNS_11BoundNetLogE
    fun:_ZN3net17HttpStreamFactory13RequestStreamEPKNS_15HttpRequestInfoEPNS_9SSLConfigEPNS_9ProxyInfoEPNS_18HttpNetworkSessionEPNS_13StreamRequest8DelegateERKNS_11BoundNetLogE
    fun:_ZN3net22HttpNetworkTransaction14DoCreateStreamEv
    fun:_ZN3net22HttpNetworkTransaction6DoLoopEi
    fun:_ZN3net22HttpNetworkTransaction5StartEPKNS_15HttpRequestInfoEP14CallbackRunnerI6Tuple1IiEERKNS_11BoundNetLogE
    fun:_ZN3net9HttpCache11Transaction13DoSendRequestEv
 }
 {
-   bug_69414
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN28PrerenderResourceHandlerTestC2Ev
-}
-{
    Bug_69906
    Memcheck:Leak
    fun:calloc
    fun:speex_alloc
    ...
    fun:*SpeexEncoderC1Ei
 }
 {
    Bug_69919
    Memcheck:Leak
@@ skipping 28 matching lines @@
    Bug_69934_c
    Memcheck:Addr4
    fun:_ZN12NPObjectStub8OnInvokeEbRK18NPIdentifier_ParamRKSt6vectorI15NPVariant_ParamSaIS4_EEPN3IPC7MessageE
    fun:_Z16DispatchToMethodI12NPObjectStubMS0_FvbRK18NPIdentifier_ParamRKSt6vectorI15NPVariant_ParamSaIS5_EEPN3IPC7MessageEEbS1_S7_RSB_EvPT_T0_RK6Tuple3IT1_T2_T3_EP6Tuple1IT4_E
    fun:_ZN3IPC16MessageWithReplyI6Tuple3Ib18NPIdentifier_ParamSt6vectorI15NPVariant_ParamSaIS4_EEE6Tuple2IRS4_RbEE18DispatchDelayReplyI12NPObjectStubMSE_FvbRKS2_RKS6_PNS_7MessageEEEEbPKSJ_PT_T0_
    fun:_ZN12NPObjectStub17OnMessageReceivedERKN3IPC7MessageE
    fun:_ZN13MessageRouter12RouteMessageERKN3IPC7MessageE
    fun:_ZN17PluginChannelBase17OnMessageReceivedERKN3IPC7MessageE
    fun:_ZN13PluginChannel17OnMessageReceivedERKN3IPC7MessageE
 }