chromeos: Try to avoid LoginUtilsImpl delegate segfault.
chromeos: Try to avoid LoginUtilsImpl delegate segfault.

This makes LoginUtilsImpl::OnProfileCreated() check that its
delegate is non-NULL before using it.  I'm hoping that this
will avoid a segfault that's apparently showing up during
testing when Chrome is killed during initialization.

Note that this is just a temporary workaround; the
underlying code is possibly still incorrect (or relying on
incorrect assumptions about the order in which things will
happen).

BUG=chromium-os:18269
TEST=none
TBR=altimofeev@chromium.org

Review URL: http://codereview.chromium.org/7590026

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@96208 0039d316-1c4b-4281-b951-d872f2087c98

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