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Format material_components_ios/BUILD.gn to be updated automatically.

Put the three lists that need to be updated (headers, sources and
include_dirs) in toplevel variables.

Change-Id: I6f6e0f9b7f8104f7fadc0493b9d316f018f098ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2066838
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743496}