Drop trusty from linux-trusty-webkit-msan-rel

This will be submitted after
https://chrome-internal-review.googlesource.com/c/infradata/config/+/1358391

Bug: 954450
Change-Id: I15bbf07503fa8bead3661dc69c8249796bce6c7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1642494Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666109}

infra/config/cr-buildbucket.cfg

@@ -3743,7 +3743,7 @@ buckets {
     builders {
       mixins: "linux-try"
       mixins: "goma-rbe-prod"
-      name: "linux-trusty-webkit-msan-rel"
+      name: "linux-webkit-msan-rel"
     }
     builders {
       mixins: "linux-try"

tools/mb/mb_config.pyl

@@ -727,7 +727,7 @@
       'linux-libfuzzer-asan-rel': 'libfuzzer_asan_release_trybot',
       'linux-ozone-rel': 'ozone_linux_release_trybot',
       'linux-rel': 'gpu_tests_release_trybot_no_symbols_use_dummy_lastchange',
-      'linux-trusty-webkit-msan-rel': 'msan_release_bot',
+      'linux-webkit-msan-rel': 'msan_release_bot',
       'linux_arm': 'release_trybot_arm',
       'linux_chromium_archive_rel_ng': 'release_bot',
       'linux_chromium_asan_rel_ng': 'asan_lsan_release_trybot',