Remove suppressions for bug 52808 (leak in HostContentSettingsMapTest.ResourceIdentifierPrefs)

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 # running overnight and removing outdated bugs/suppressions.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 4139 matching lines @@
    fun:_ZN17URLRequestHttpJobD0Ev
 }
 {
    bug_52826
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN14TestingProfile20CreateRequestContextEv
    fun:_ZN20GoogleURLTrackerTest20CreateRequestContextEv
 }
 {
-   bug_52828
-   Memcheck:Leak
-   fun:_Znw*
-   ...
-   fun:_ZN4base10JSONReader10BuildValueEb
-   fun:_ZN4base10JSONReader11JsonToValueERKSsbb
-   fun:_ZN4base10JSONReader18ReadAndReturnErrorERKSsbPiPSs
-   fun:_ZN4base10JSONReader4ReadERKSsb
-   fun:_ZN81_GLOBAL__N_chrome_browser_host_content_settings_map_unittest.cc*
-}
-{
    bug_52831
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:*InotifyReaderTask3RunEv
    fun:_ZN11MessageLoop7RunTaskEP4Task
    fun:_ZN11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
    fun:_ZN11MessageLoop6DoWorkEv
    fun:_ZN4base18MessagePumpDefault3RunEPNS_11MessagePump8DelegateE
    fun:_ZN11MessageLoop11RunInternalEv
@@ skipping 27 matching lines @@
    bug_52836
    Memcheck:Cond
    ...
    fun:_ZN3IPC7Channel11ChannelImpl23ProcessIncomingMessagesEv
    fun:_ZN3IPC7Channel11ChannelImpl28OnFileCanReadWithoutBlockingEi
    fun:_ZN4base19MessagePumpLibevent21FileDescriptorWatcher28OnFileCanReadWithoutBlockingEiPS0_
    fun:_ZN4base19MessagePumpLibevent22OnLibeventNotificationEisPv
    fun:event_process_active
    fun:event_base_loop
 }