[login_manager] Stop relying on symlink to X that we create specially
[login_manager] Stop relying on symlink to X that we create specially

    Instead of relying on a special symlink to X that we create for our project,
    rely on the one created in the X server ebuild anyway.

    BUG=11553
TEST=install, boot.  UI comes up.

Change-Id: Ic3515ac5218014eb08b640638fd2270fd1e31052

Review URL: http://codereview.chromium.org/6334031

joshfire/chromiumos-platform-login_manager,joshfire/chromiumos-platform-login_manager,chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager,chadversary/chromiumos.platform.login_manager,joshfire/chromiumos-platform-login_manager