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This CL makes the paths in the code coverage html report relative so
that the reports are portable.

Bug: 757515
Change-Id: I5685437a4b946ec30c3fcab17fa3bb5ddeb7c744
Reviewed-on: https://chromium-review.googlesource.com/696294Reviewed-by: Mike Baxley <baxley@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505854}