Widen suppression for disk_cache leaks

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 # running overnight and removing outdated bugs/suppressions.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 4695 matching lines @@
    fun:_ZN7WebCore26InspectorBackendDispatcher8dispatchERKN3WTF6StringE
    fun:_ZN7WebCore19InspectorController27dispatchMessageFromFrontendERKN3WTF6StringE
    fun:_ZN6WebKit20WebDevToolsAgentImpl26dispatchOnInspectorBackendERKNS_9WebStringE
    fun:_ZN16DRTDevToolsAgent4callERKN6WebKit9WebStringE
    fun:_ZN16DRTDevToolsAgent13AsyncCallTask10runIfValidEv
 }
 {
    bug_87396_a
    Memcheck:Leak
    fun:_Znw*
-   fun:_ZN10disk_cache11BackendImpl8NewEntryENS_4AddrEPPNS_9EntryImplE
+   ...
    fun:_ZN10disk_cache11BackendImpl10MatchEntryERKSsjbNS_4AddrEPb
    fun:_ZN10disk_cache11BackendImpl13OpenEntryImplERKSs
    fun:_ZN10disk_cache11BackendImpl13SyncOpenEntryERKSsPPNS_5EntryE
    fun:_ZN10disk_cache9BackendIO23ExecuteBackendOperationEv
    fun:_ZN10disk_cache9BackendIO16ExecuteOperationEv
 }
 {
    bug_87396_b
    Memcheck:Addr4
    fun:_ZN10disk_cache11BackendImpl13SyncOpenEntryERKSsPPNS_5EntryE
@@ skipping 146 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
 }