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This change completes the removal of package_name from
build/java_apk.gyp and removes it from all the places
which still refer to it.

'package_name' used to be how you specified the intermediate
directory when building an APK. Now we use the target name and
includers no longer need to set the intermediate directory
explicitly. However one use in java_apk for setting additional
resources files seems to have crept through the refactoring.

BUG=405963

Review URL: https://codereview.chromium.org/487223003

Cr-Commit-Position: refs/heads/master@{#293498}