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When building using jumbo, interfaces and implementations
end up in the same scope. The interfaces with the same
category name conflicts.

This commit solves the issue by renaming the category to
something more file specific.

Bug: 803406
Change-Id: I21a6645640d40b0ed6cd1324dfc30efa87da23c0
Reviewed-on: https://chromium-review.googlesource.com/1140162Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Oscar Johansson <oscarj@opera.com>
Cr-Commit-Position: refs/heads/master@{#575624}