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This CL allows developers to use header files ending with 'mojom-forward.h'
in public directories.
Traditionally, we use 'mojom-shared.h' files, but we now have 'mojom-forward.h'
filed and it is better to use forward header files.
This is discussed here:
https://chromium.slack.com/archives/CGGGVPSQ4/p1580370782044400

Bug: n/a
Change-Id: I2bd1bd3d304d8a46e8df5bfd3ebc0d49f5497d22
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032686Reviewed-by: Hiroki Nakagawa <nhiroki@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Reviewed-by: Makoto Shimazu <shimazu@chromium.org>
Commit-Queue: Eriko Kurimoto <elkurin@google.com>
Cr-Commit-Position: refs/heads/master@{#737241}