Fix BrowserAccessibilityManager valgrind errors.

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 # running overnight and removing outdated bugs/suppressions.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 5180 matching lines @@
    fun:_ZN71SyncUIUtilTest_ConstructAboutInformationWithUnrecoverableErrorTest_Test8TestBodyEv
 }
 {
    bug_91771_b
    Memcheck:Cond
    ...
    fun:_ZN12sync_ui_util25ConstructAboutInformationEP18ProfileSyncServicePN4base15DictionaryValueE
    fun:_ZN71SyncUIUtilTest_ConstructAboutInformationWithUnrecoverableErrorTest_Test8TestBodyEv
 }
 {
-   bug_91845_a
-   Memcheck:Leak
-   fun:_Znw*
-   ...
-   fun:_ZN27BrowserAccessibilityManager23CreateAccessibilityTreeEP20BrowserAccessibilityRKN11webkit_glue16WebAccessibilityEi
-   ...
-   fun:_ZN60BrowserAccessibilityManagerTest_TestCreateEmptyDocument_Test8TestBodyEv
-}
-{
-   bug_91845_b
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN27BrowserAccessibilityManager6CreateEP10_GtkWidgetRKN11webkit_glue16WebAccessibilityEP28BrowserAccessibilityDelegateP27BrowserAccessibilityFactory
-   fun:_ZN27BrowserAccessibilityManager19CreateEmptyDocumentEP10_GtkWidgetN11webkit_glue16WebAccessibility5StateEP28BrowserAccessibilityDelegateP27BrowserAccessibilityFactory
-   fun:_ZN60BrowserAccessibilityManagerTest_TestCreateEmptyDocument_Test8TestBodyEv
-}
-{
-   bug_91845_c
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN9__gnu_cxx13new_allocatorIPNS_15_Hashtable_nodeISt4pairIKiP20BrowserAccessibilityEEEE8allocateEmPKv
-   fun:_ZNSt12_Vector_baseIPN9__gnu_cxx15_Hashtable_nodeISt4pairIKiP20BrowserAccessibilityEEESaIS8_EE11_M_allocateEm
-   fun:_ZNSt6vectorIPN9__gnu_cxx15_Hashtable_nodeISt4pairIKiP20BrowserAccessibilityEEESaIS8_EE20_M_allocate_and_copyIPS8_EESC_mT_SD_
-   fun:_ZNSt6vectorIPN9__gnu_cxx15_Hashtable_nodeISt4pairIKiP20BrowserAccessibilityEEESaIS8_EE7reserveEm
-   fun:_ZN9__gnu_cxx9hashtableISt4pairIKiP20BrowserAccessibilityEiNS_4hashIiEESt10_Select1stIS5_ESt8equal_toIiESaIS4_EE21_M_initialize_bucketsEm
-   fun:_ZN9__gnu_cxx9hashtableISt4pairIKiP20BrowserAccessibilityEiNS_4hashIiEESt10_Select1stIS5_ESt8equal_toIiESaIS4_EEC2EmRKS7_RKSB_RKSaIS5_E
-   fun:_ZN9__gnu_cxx9hashtableISt4pairIKiP20BrowserAccessibilityEiNS_4hashIiEESt10_Select1stIS5_ESt8equal_toIiESaIS4_EEC1EmRKS7_RKSB_RKSaIS5_E
-   fun:_ZN9__gnu_cxx8hash_mapIiP20BrowserAccessibilityNS_4hashIiEESt8equal_toIiESaIS2_EEC2Ev
-   fun:_ZN9__gnu_cxx8hash_mapIiP20BrowserAccessibilityNS_4hashIiEESt8equal_toIiESaIS2_EEC1Ev
-   fun:_ZN27BrowserAccessibilityManagerC2EP6NSViewRKN11webkit_glue16WebAccessibilityEP28BrowserAccessibilityDelegateP27BrowserAccessibilityFactory
-   fun:_ZN30BrowserAccessibilityManagerMacC2EP6NSViewRKN11webkit_glue16WebAccessibilityEP28BrowserAccessibilityDelegateP27BrowserAccessibilityFactory
-   fun:_ZN30BrowserAccessibilityManagerMacC1EP6NSViewRKN11webkit_glue16WebAccessibilityEP28BrowserAccessibilityDelegateP27BrowserAccessibilityFactory
-   fun:_ZN27BrowserAccessibilityManager6CreateEP6NSViewRKN11webkit_glue16WebAccessibilityEP28BrowserAccessibilityDelegateP27BrowserAccessibilityFactory
-   fun:_ZN27BrowserAccessibilityManager19CreateEmptyDocumentEP6NSViewN11webkit_glue16WebAccessibility5StateEP28BrowserAccessibilityDelegateP27BrowserAccessibilityFactory
-   fun:_ZN60BrowserAccessibilityManagerTest_TestCreateEmptyDocument_Test8TestBodyEv
-}
-{
    bug_92123
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN11MessageLoop10DeleteSoonIN4base20MessageLoopProxyImplEEEvRKN15tracked_objects8LocationEPKT_
    fun:_ZNK4base20MessageLoopProxyImpl10OnDestructEv
    fun:_ZN4base22MessageLoopProxyTraits8DestructEPKNS_16MessageLoopProxyE
    fun:_ZNK4base20RefCountedThreadSafeINS_16MessageLoopProxyENS_22MessageLoopProxyTraitsEE7ReleaseEv
    fun:_ZN13scoped_refptrIN4base16MessageLoopProxyEED1Ev
    fun:_ZN3net16HostResolverImpl3JobD1Ev
    fun:_ZN4base20RefCountedThreadSafeIN3net16HostResolverImpl3JobENS_33DefaultRefCountedThreadSafeTraitsIS3_EEE14DeleteInternalEPKS3_
@@ skipping 34 matching lines @@
    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_92396
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN27BrowserAccessibilityManager6CreateEP6NSViewRKN11webkit_glue16WebAccessibilityEP28BrowserAccessibilityDelegateP27BrowserAccessibilityFactory
-   fun:_ZN27BrowserAccessibilityManager19CreateEmptyDocumentEP6NSViewN11webkit_glue16WebAccessibility5StateEP28BrowserAccessibilityDelegateP27BrowserAccessibilityFactory
-   fun:_ZN60BrowserAccessibilityManagerTest_TestCreateEmptyDocument_Test8TestBodyEv
-   fun:_ZN7testing8internal38HandleSehExceptionsInMethodIfSupportedINS_4TestEvEET0_PT_MS4_FS3_vEPKc
-   fun:_ZN7testing8internal35HandleExceptionsInMethodIfSupportedINS_4TestEvEET0_PT_MS4_FS3_vEPKc
-}
-{
    bug_92548
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZNSsC1ERKSsjj
    fun:_ZNK4GURL15ComponentStringERKN9url_parse9ComponentE
    fun:_ZNK4GURL4pathEv
    fun:_ZN3net8HttpUtil14PathForRequestERK4GURL
    fun:_ZN3net15HttpBasicStream11SendRequestERKNS_18HttpRequestHeadersEPNS_16UploadDataStreamEPNS_16HttpResponseInfoEP14CallbackRunnerI6Tuple1IiEE
    fun:_ZN3net22HttpNetworkTransaction13DoSendRequestEv
@@ skipping 73 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
 }