[code coverage] Clean up code coverage comments in test_suites.pyl

This CL deletes some comments that shouldn't be there.

Change-Id: I8cb2bc8838be3b265028dd99e75c88b7dd2c0a9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1546726Reviewed-by: Ben Pastene <bpastene@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646420}

testing/buildbot/test_suites.pyl

@@ -389,10 +389,6 @@
       'chromedriver_replay_unittests': {},
     },
 
-    # Identical to chromeos_device_friendly_gtests below minus
-    #   - cros_vm_sanity_test
-    #   - chrome_all_tast_tests
-
     # Tests that run in Chrome OS VMs.
     # NOTE: We only want a small subset of test suites here, because most
     # suites assume that they stub out the underlying device hardware.