Make browser_tests on asan ci only

linux_chromium_asan_rel_ng browser_tests uses 15% of CQ capacity to
catch just .04% of bad CLs. sshrimp@ analyzed this using the rts eval
framework in https://crrev.com/c/3911309

Bug: 1368345
Change-Id: Iffd095b7a1ce3a3ec96b1b42b558e619c02eb958
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3920310
Auto-Submit: Gregory Guterman <[email protected]>
Commit-Queue: Gregory Guterman <[email protected]>
Reviewed-by: Erik Staab <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1052019}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 1d06e4a..bf27c39 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -897,6 +897,7 @@
         },
       },
       'Linux ASan LSan Tests (1)': {
+        'ci_only': True,
         # These are very slow on the ASAN trybot for some reason.
         # crbug.com/1257927
         'swarming': {