net: check the size of socket path in FillAddress() function
net: check the size of socket path in FillAddress() function

That way UnixDomainServerSocket can benefit from it as well,
as it does not make this check itself before calling
UnixDomainClientSocket::FillAddress().

BUG=None
TEST=net_unittests --gtest_filter=*UnixDomain*
R=mmenke@chromium.org

Review URL: https://codereview.chromium.org/1753113004

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#378776}

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