Fix Valgrind errors that occurred during testing.

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 # running overnight and removing outdated bugs/suppressions.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 3259 matching lines @@
    fun:_pt_thread_death_internal
    fun:PR_DetachThread
    fun:_ZN3net12CertVerifier7Request8DoVerifyEv
    fun:_Z16DispatchToMethodIN3net12CertVerifier7RequestEMS2_FvvEEvPT_T0_RK6Tuple0
    fun:_ZN14RunnableMethodIN3net12CertVerifier7RequestEMS2_FvvE6Tuple0E3RunEv
    fun:*12WorkerThread10ThreadMainEv
    fun:_Z10ThreadFuncPv
    fun:start_thread
    fun:clone
 }
-{
-   bug_62943 (Cond)
-   Memcheck:Cond
-   ...
-   fun:_ZN3gfx8PNGCodec6EncodeEPKhNS0_11ColorFormatEiiibPSt6vectorIhSaIhEE
-   fun:_ZN3gfx8PNGCodec18EncodeBGRASkBitmapERK8SkBitmapbPSt6vectorIhSaIhEE
-   fun:_ZN13safe_browsing26ClientSideDetectionService32StartClientReportPhishingRequestERK4GURLd8SkBitmapP14CallbackRunnerI6Tuple2IS1_bEE
-   fun:_Z16DispatchToMethodIN13safe_browsing26ClientSideDetectionServiceEMS1_FvRK4GURLd8SkBitmapP14CallbackRunnerI6Tuple2IS2_bEEES2_dS5_SA_EvPT_T0_RK6Tuple4IT1_T2_T3_T4_E
-}
-{
-   bug_62943 (Value4)
-   Memcheck:Value4
-   ...
-   fun:_ZN3gfx8PNGCodec6EncodeEPKhNS0_11ColorFormatEiiibPSt6vectorIhSaIhEE
-   fun:_ZN3gfx8PNGCodec18EncodeBGRASkBitmapERK8SkBitmapbPSt6vectorIhSaIhEE
-   fun:_ZN13safe_browsing26ClientSideDetectionService32StartClientReportPhishingRequestERK4GURLd8SkBitmapP14CallbackRunnerI6Tuple2IS1_bEE
-   fun:_Z16DispatchToMethodIN13safe_browsing26ClientSideDetectionServiceEMS1_FvRK4GURLd8SkBitmapP14CallbackRunnerI6Tuple2IS2_bEEES2_dS5_SA_EvPT_T0_RK6Tuple4IT1_T2_T3_T4_E
-}
-{
-   bug_62943 (Leak)
-   Memcheck:Leak
-   ...
-   fun:_ZN21FakeURLFetcherFactory16CreateURLFetcherEiRK4GURLN10URLFetcher11RequestTypeEPNS3_8DelegateE
-   fun:_ZN10URLFetcher6CreateEiRK4GURLNS_11RequestTypeEPNS_8DelegateE
-   fun:_ZN13safe_browsing26ClientSideDetectionService32StartClientReportPhishingRequestERK4GURLd8SkBitmapP14CallbackRunnerI6Tuple2IS1_bEE
-   fun:_Z16DispatchToMethodIN13safe_browsing26ClientSideDetectionServiceEMS1_FvRK4GURLd8SkBitmapP14CallbackRunnerI6Tuple2IS2_bEEES2_dS5_SA_EvPT_T0_RK6Tuple4IT1_T2_T3_T4_E
-}