Fix TSan flakiness

Using example from TSan docs.

Change-Id: I87294447baf5bbc11bbfe036bafebb1d4bd6dad3

BUILD.gn

diff --git a/BUILD.gn b/BUILD.gn
index 0430b49..0d3c7c2 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -40,8 +40,10 @@
     "src/ipc:perfetto_ipc_unittests",
     "src/protozero:protozero_unittests",
     "src/tracing:tracing_unittests",
-    "tools/sanitizers_unittests",
   ]
+  if (!build_with_chromium) {
+    deps += [ "tools/sanitizers_unittests" ]
+  }
 }
 
 if (!build_with_chromium) {