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Revert of Introduce AndroidFocusRules and NativeWidgetAndroid (patchset #13 id:560001 of https://codereview.chromium.org/1403293003/ )

Reason for revert:
Reverting the CL as the Android Aura project has been cancelled.

Also removing menu_config_android.cc which was added in https://codereview.chromium.org/1477253002.

Original issue's description:
> Introduce AndroidFocusRules and NativeWidgetAndroid
>
> NativeWidgetAndroidis very similar to NativeWidgetAura. It
> owns a WindowTreeHost and FocusController which initialized
> from AndroidFocusRules. Aura on Android should use this
> native widget for top level windows. It should create and host
> the Widget in a native Android window.
>
> BUG=507792
>
> Committed: https://crrev.com/31db6ee3532c748f40d2ae00514b5d91031d78e7
> Cr-Commit-Position: refs/heads/master@{#360645}

TBR=sadrul@chromium.org,sky@chromium.org,bshe@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=507792

Review URL: https://codereview.chromium.org/1639003002

Cr-Commit-Position: refs/heads/master@{#371918}