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`_framework_headers_config` is needed by `_framework_public_config` for
the `framework_dirs` variable, even if no `public_headers` defined.

Introduced by https://crrev.com/c/2061194.

Change-Id: I82964f1266aa7c1764f33912b02b48ddf7677ba9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2098155
Commit-Queue: Bang Lee <banl@microsoft.com>
Auto-Submit: Bang Lee <banl@microsoft.com>
Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749190}