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Since COMPONENT_EXPORT(MEDIA) is too long, still keep MEDIA_EXPORT. But
instead of defining our own, define it to be COMPONENT_EXPORT(MEDIA).

Bug: None
Change-Id: I0b24844d3227f918ef1d567a405a03356f66d289
Reviewed-on: https://chromium-review.googlesource.com/c/1313879
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605190}