Revert valgrind suppression added in r65660.

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
diff --git a/tools/valgrind/memcheck/suppressions.txt b/tools/valgrind/memcheck/suppressions.txt
index f111726a3b6152234228a6521132773e045b61c8..611938d36148809497c518d8b4746ed9ecfa9f51 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -3286,22 +3286,6 @@
    fun:CERT_PKIXVerifyCert
 }
 {
-   bug_62674
-   Memcheck:Addr4
-   fun:_ZN3net25SingleRequestHostResolver6CancelEv
-   fun:_ZN3net25SingleRequestHostResolverD1Ev
-   fun:_ZN3net13TCPConnectJobD0Ev
-   fun:_Z26STLDeleteContainerPointersISt23_Rb_tree_const_iteratorIPN3net10ConnectJobEEEvT_S5_
-   fun:_Z17STLDeleteElementsISt3setIPN3net10ConnectJobESt4lessIS3_ESaIS3_EEEvPT_
-   fun:_ZN3net8internal26ClientSocketPoolBaseHelper5Group13RemoveAllJobsEv
-   fun:_ZN3net8internal26ClientSocketPoolBaseHelper20CancelAllConnectJobsEv
-   fun:_ZN3net8internal26ClientSocketPoolBaseHelper5FlushEv
-   fun:_ZN3net8internal26ClientSocketPoolBaseHelperD1Ev
-   fun:_ZN3net20ClientSocketPoolBaseINS_15TCPSocketParamsEED1Ev
-   fun:_ZN3net19TCPClientSocketPoolD0Ev
-   fun:_ZN10scoped_ptrIN3net19TCPClientSocketPoolEED1Ev
-}
-{
    bug_63015
    Memcheck:Addr2
    fun:_ZN7WebCore18stringToLengthTypeERPKtS1_