Rename GN public variables.
Rename GN public variables.

forward_dependent_configs_from => public_deps
direct_dependent_configs => public_configs

Change-Id: I93beca2109181a2aac8d5793c3464b3af8b6ab9b
Reviewed-on: https://chromium-review.googlesource.com/219695
Reviewed-by: Shannon Woods <0f3694938fd5703bd548127ee497e4d604509bef@chromium.org>
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Tested-by: Brett Wilson <fb88c5421e7dc886db1d0953e53631b4de4e3e86@chromium.org>

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