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Instead, pass the --plist to tweak on the command line. This way the
script can be used in both GYP and GN builds.

There is one behavior change: previously passing --keystone=1 would only
insert the Keystone keys if env['CONFIGURATION']=='Release' and after this
change, the keys will be added regardless of the build configuration if the
flag is passed.

BUG=297668

Review URL: https://codereview.chromium.org/1881053002

Cr-Commit-Position: refs/heads/master@{#386854}