Add an elided frame to suppress one more leak in CookiesWindowController.

tools/valgrind/memcheck/suppressions_mac.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, 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.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 1274 matching lines @@
    fun:_ZN7testingL35HandleExceptionsInMethodIfSupportedINS_4TestEvEET0_PT_MS3_FS2_vEPKc
 }
 {
    bug_69757b
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN9__gnu_cxx13new_allocatorISt13_Rb_tree_nodeISt4pairIKSsPN3net22HttpAuthHandlerFactoryEEEE8allocateEmPKv
    fun:_ZNSt8_Rb_treeISsSt4pairIKSsPN3net22HttpAuthHandlerFactoryEESt10_Select1stIS5_ESt4lessISsESaIS5_EE11_M_get_nodeEv
    fun:_ZNSt8_Rb_treeISsSt4pairIKSsPN3net22HttpAuthHandlerFactoryEESt10_Select1stIS5_ESt4lessISsESaIS5_EE14_M_create_nodeERKS5_
    fun:_ZNSt8_Rb_treeISsSt4pairIKSsPN3net22HttpAuthHandlerFactoryEESt10_Select1stIS5_ESt4lessISsESaIS5_EE9_M_insertEPSt18_Rb_tree_node_baseSD_RKS5_
+   ...
    fun:_ZNSt8_Rb_treeISsSt4pairIKSsPN3net22HttpAuthHandlerFactoryEESt10_Select1stIS5_ESt4lessISsESaIS5_EE13insert_uniqueESt17_Rb_tree_iteratorIS5_ERKS5_
    fun:_ZNSt3mapISsPN3net22HttpAuthHandlerFactoryESt4lessISsESaISt4pairIKSsS2_EEE6insertESt17_Rb_tree_iteratorIS7_ERKS7_
    fun:_ZNSt3mapISsPN3net22HttpAuthHandlerFactoryESt4lessISsESaISt4pairIKSsS2_EEEixERS6_
    fun:_ZN3net30HttpAuthHandlerRegistryFactory21RegisterSchemeFactoryERKSsPNS_22HttpAuthHandlerFactoryE
    fun:_ZN3net22HttpAuthHandlerFactory13CreateDefaultEPNS_12HostResolverE
    fun:_ZN21TestURLRequestContext4InitEv
    fun:_ZN21TestURLRequestContextC2Ev
    fun:_ZN21TestURLRequestContextC1Ev
    fun:_ZN27TestURLRequestContextGetter20GetURLRequestContextEv
    fun:_ZN23URLRequestContextGetter14GetCookieStoreEv
    fun:-[CookiesWindowController loadTreeModelFromProfile]
    fun:-[CookiesWindowController initWithProfile:databaseHelper:storageHelper:appcacheHelper:indexedDBHelper:]
    fun:_ZN12_GLOBAL__N_127CookiesWindowControllerTest5SetUpEv
    fun:_ZN7testingL35HandleExceptionsInMethodIfSupportedINS_4TestEvEET0_PT_MS3_FS2_vEPKc
 }
 {
    bug_69757c
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN14TestingProfile20CreateRequestContextEv
    fun:_ZN12_GLOBAL__N_127CookiesWindowControllerTest5SetUpEv
    fun:_ZN7testingL35HandleExceptionsInMethodIfSupportedINS_4TestEvEET0_PT_MS3_FS2_vEPKc
 }