Use 8-core bots to run content_browsertests on android-11-x86-fyi-rel

This test suite is pretty large so use more powerful bots to run it.

Bug: 1137474
Change-Id: I66beafabca2a350495ec247d82788914255542ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3001410
Auto-Submit: Haiyang Pan <[email protected]>
Reviewed-by: Yuke Liao <[email protected]>
Commit-Queue: Yuke Liao <[email protected]>
Cr-Commit-Position: refs/heads/master@{#897925}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 59847b91..eb3f0bc2 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -1257,6 +1257,11 @@
         # are fixed.
         'swarming': {
           'shards': 30,
+          'dimension_sets': [
+            {
+              'machine_type': 'e2-standard-8', # use 8-core to shorten runtime
+            },
+          ],
         },
       },
       'android-arm64-proguard-rel': {