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As part of the progress of removing reference build from perf waterfall, this CL disabled the reference builds on system_health.common on all platforms, i.e.,
system_health.common_mobile.reference is no longer running on:
Android Nexus5 Perf, Android Nexus5X WebView Perf, android-go_webview-perf, android-go-perf, android-pixel2_weblayer-perf, android-pixel2_webview-perf, android-pixel2-perf
system_health.common_desktop.reference is no longer running on:
linux-perf, mac-10_12_laptop_low_end-perf, mac-10_13_laptop_high_end-perf, win-10_laptop_low_end-perf, win-10-perf

More details can be found in:
go/ref-builds-prd
go/chromeperf-refless

Bug: chromium:1108663
Change-Id: I9b0bee9818b74f2a26fb0ed5fbc0286526dfac56
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2337380Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Auto-Submit: Wenbin Zhang <wenbinzhang@google.com>
Commit-Queue: Wenbin Zhang <wenbinzhang@google.com>
Cr-Commit-Position: refs/heads/master@{#794891}