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This moves a flag from CommandLineUtil to AwSwitches with the others,
and removes the //aw:common_commandline_java build target, which isn't
needed.

Test: ninja -C out/aw system_webview_apk
Bug: 1035235
Change-Id: Ib58d4269b8dc845948bc83a8ad788dc074376a48
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2005609
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733042}