Update suppression for crbug.com/29675.

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 # running overnight and removing outdated bugs/suppressions.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 2020 matching lines @@
    fun:_ZN7SkDeque9push_backEv
    fun:_ZN8SkCanvas12internalSaveENS_9SaveFlagsE
    fun:_ZN8SkCanvas4saveENS_9SaveFlagsE
    fun:_ZN19PlatformContextSkia4saveEv
    fun:_ZN7WebCore15GraphicsContext17savePlatformStateEv
 }
 {
    bug_29675
    Memcheck:Leak
    fun:_Znw*
+   fun:_ZN21BrowserMainPartsPosix24PostMainMessageLoopStartEv
+   fun:_ZN16BrowserMainParts20MainMessageLoopStartEv
    fun:_Z11BrowserMainRK18MainFunctionParams
 }
 {
    bug_30346
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN13TCMallocGuardC1Ev
    fun:_Z41__static_initialization_and_destruction_0ii
    fun:_GLOBAL__I__ZN61FLAG__namespace_do_not_use_directly_use_DECLARE_int64_instead43FLAGS_tcmalloc_large_alloc_report_thresholdE
@@ skipping 1423 matching lines @@
    bug_48557_2
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN4base10SyncSocket10CreatePairEPPS0_
    fun:_ZN15AudioSyncReader4InitEv
    fun:_ZN17AudioRendererHost14OnCreateStreamERKN3IPC7MessageEiRK37ViewHostMsg_Audio_CreateStream_Paramsb
    fun:_ZN21AudioRendererHostTest16CreateLowLatencyEv
    fun:_ZN51AudioRendererHostTest_CreateLowLatencyAndClose_Test8TestBodyEv
 }
 {
-   bug_48998
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN21BrowserMainPartsPosix16TemporaryPosix_1Ev
-   fun:_Z11BrowserMainRK18MainFunctionParams
-   fun:ChromeMain
-   fun:main
-}
-{
    bug_49262
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN9__gnu_cxx13new_allocatorISt13_Rb_tree_nodeIPN11PrefService10PreferenceEEE8allocateEjPKv
    fun:_ZNSt8_Rb_treeIPN11PrefService10PreferenceES2_St9_IdentityIS2_ENS0_24PreferencePathComparatorESaIS2_EE11_M_get_nodeEv
    fun:_ZNSt8_Rb_treeIPN11PrefService10PreferenceES2_St9_IdentityIS2_ENS0_24PreferencePathComparatorESaIS2_EE14_M_create_nodeERKS2_
    fun:_ZNSt8_Rb_treeIPN11PrefService10PreferenceES2_St9_IdentityIS2_ENS0_24PreferencePathComparatorESaIS2_EE9_M_insertEPSt18_Rb_tree_node_baseS9_RKS2_
    fun:_ZNSt8_Rb_treeIPN11PrefService10PreferenceES2_St9_IdentityIS2_ENS0_24PreferencePathComparatorESaIS2_EE16_M_insert_uniqueERKS2_
    fun:_ZNSt3setIPN11PrefService10PreferenceENS0_24PreferencePathComparatorESaIS2_EE6insertERKS2_
    fun:_ZN11PrefService18RegisterPreferenceEPNS_10PreferenceE
@@ skipping 114 matching lines @@
    fun:_ZN8syncable12MutableEntryC1EPNS_16WriteTransactionENS_6CreateERKNS_2IdERKSs
 }
 {
    bug_50336
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN8syncable11UnpackEntryEP12SQLStatementPPNS_11EntryKernelE
    fun:_ZN8syncable21DirectoryBackingStore11LoadEntriesEPSt3setIPNS_11EntryKernelENS_9LessFieldINS_15MetahandleFieldELS5_0EEESaIS3_EE
    fun:_ZN8syncable44DirectoryBackingStoreTest_DeleteEntries_Test8TestBodyEv
 }