Error from build_image:

ARC Packages Cache builder. Failed to parse.
  org.chromium.arc.cachebuilder.InvalidStructureException: Could not parse prop file line: setprop
  	at org.chromium.arc.cachebuilder.Utils.readSystemProperties(Utils.java:164)
  	at org.chromium.arc.cachebuilder.CacheGenerator.process(CacheGenerator.java:778)
  	at org.chromium.arc.cachebuilder.CacheGenerator.main(CacheGenerator.java:877)

Breakage caused by
ag/5411839

"setprop" shouldn't be in the PRODCUT_DEFAULT_PROPERTY_OVERRIDES.
Fix is simple.

Fix up for review:
ag/5464522

The above CL has merged. Request merge request to M71 for the above CL (ag/5464522). The CL introduced the bug is being merged to M71.

This bug requires manual review: M71 has already been promoted to the beta branch, so this requires manual review
Please contact the milestone owner if you have questions.
Owners: benmason@(Android), kariahda@(iOS), kbleicher@(ChromeOS), govind@(Desktop)

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Approved for ChromeOS M71

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

ag/5477537 is the merge CL. Adding Merge-Merged label manually for recording.

pi-pfq is green, I assume this is fixed. Please reopen if it's not the case.

This issue has been approved for a merge. Please merge the fix to any appropriate branches as soon as possible!

If all merges have been completed, please remove any remaining Merge-Approved labels from this issue.

Thanks for your time! To disable nags, add the Disable-Nags label.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot