[Sheriff] Double browser_tests shard count on Linux CFI bot.

Bug: chromium:1361973
Change-Id: I4dc52f92cb1084ef4244ba37f81d16da3aa3f6c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3887579
Reviewed-by: Dominique Fauteux-Chapleau <[email protected]>
Commit-Queue: Titouan Rigoudy <[email protected]>
Commit-Queue: Titouan Rigoudy <[email protected]>
Owners-Override: Titouan Rigoudy <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1045180}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index f563aaf..13858c9 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -934,6 +934,11 @@
           'shards': 30, # https://crbug.com/1103330
         },
       },
+      'Linux CFI': {
+        'swarming': {
+          'shards': 20,  # https://crbug.com/1361973
+        },
+      },
       'Linux Chromium OS ASan LSan Tests (1)': {
         # These are very slow on the ASAN trybot for some reason.
         # crbug.com/1257927