Linux: remove the use of UNIX_PATH_MAX for systems which don't have it.
Linux: remove the use of UNIX_PATH_MAX for systems which don't have it.

Not all kernel headers seem to include UNIX_PATH_MAX. Instead, use
sizeof.

Review URL: http://codereview.chromium.org/48047


git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@11821 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser