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BrokerClient::Readlink returns -ENAMETOOLONG if the buffer is too small
for the pathname, but this is inconsistent with POSIX which fills up
the buffer with part of the pathname, and only returns -ENAMETOOLONG
if the actual pathname is longer than PATH_MAX or an individual
pathname component is longer than NAME_MAX.

Change-Id: I282f2ead6814bbd799e286a6e80ed5991ceeb54e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2379470
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802436}