GitLab

Recommends base/component_export.h and deprecates the old pattern.

Bug: None
Change-Id: I8bb5d5fbdbafbb9310638d7ce50c8acb5194dce7
Reviewed-on: https://chromium-review.googlesource.com/887624Reviewed-by: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531986}