gin_unittests: Suppress leaks

These are old leaks, so suppressing seems appropriate.

Bug: 831667
Change-Id: Ic5efd1d06bb220d99edad1f9d44db5e7371f6ed5
Reviewed-on: https://chromium-review.googlesource.com/1061501
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Hans Wennborg <hans@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#559126}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 77e4c1e0a55cb6cd6411cbb25faca20b966e6581

sanitizers/lsan_suppressions.cc

@@ -97,6 +97,9 @@ char kLSanDefaultSuppressions[] =
     // https://crbug.com/795148
     "leak:third_party/fontconfig/\n"
 
+    // https://crbug.com/831667
+    "leak:gin/*_unittest.cc\n"
+
     // PLEASE READ ABOVE BEFORE ADDING NEW SUPPRESSIONS.
 
     // End of suppressions.