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All we need to do is ensure that there's a leading '/' in the path, we
don't expect the path to exist necessarily, and we don't need to resolve
symlinks.  We just want to be able to search for directories by doing a
string search of the form "/foo/".  And since we don't use realpath
anymore, this should work with distributed compilation systems like icecc.

This will also avoid mis-classification of files in chromium checkouts
that are inside a directory with the same name as one of the so-called
"banned" directories, eg a checkout in /home/gen/chromium/.

BUG=583454

Change-Id: I01f6417eadf88f0e6d29624014573022e29093ff
Reviewed-on: https://chromium-review.googlesource.com/975041
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#546769}