Remove TSAN suppresion in P2PTransport

The error seems to have been fixed in an intervening refactoring.

Bug: chromium:348982
Change-Id: I79771bd75624cf4fca6b7e3b248679fc28228c36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2562181
Commit-Queue: Harald Alvestrand <hta@chromium.org>
Reviewed-by: Alexander Potapenko <glider@chromium.org>
Cr-Commit-Position: refs/heads/master@{#831386}

build/sanitizers/tsan_suppressions.cc

@@ -73,10 +73,6 @@ char kTSanDefaultSuppressions[] =
     // http://crbug.com/328868
     "race:PR_Lock\n"
 
-    // http://crbug.com/348982
-    "race:cricket::P2PTransportChannel::OnConnectionDestroyed\n"
-    "race:cricket::P2PTransportChannel::AddConnection\n"
-
     // http://crbug.com/348984
     "race:sctp_express_handle_sack\n"
     "race:system_base_info\n"