Remove Chrome-perf as the valid pool for perf json config

Bug:chromium:818319
Cq-Include-Trybots: master.tryserver.chromium.perf:obbs_fyi
Change-Id: I3a7b020744e9fa4ce73ef890ff744da1d0563327

NOTRY=true  # test by PRESUBMIT

Change-Id: I3a7b020744e9fa4ce73ef890ff744da1d0563327
Reviewed-on: https://chromium-review.googlesource.com/1124408Reviewed-by: Emily Hanley <eyaich@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#572187}

tools/perf/core/perf_json_config_validator.py

@@ -12,7 +12,6 @@ _VALID_SWARMING_DIMENSIONS = {
     'gpu', 'device_ids', 'os', 'pool', 'perf_tests', 'perf_tests_with_args',
     'device_os', 'device_type', 'device_os_flavor', 'id'}
 _VALID_PERF_POOLS = {
-    'Chrome-perf',
     'chrome.tests.perf', 'chrome.tests.perf-webview',
     'chrome.tests.perf-fyi', 'chrome.tests.perf-webview-fyi'}