Fix browser crash on shutdown when ProfileImplIOData::Handle::Init isn't called.

Fix browser crash on shutdown when ProfileImplIOData::Handle::Init isn't called.

With ephemeral profiles, in some cases, a Handle will be created and destroyed
without being initialized. Root cause of why the object is created is still not
known, but this change prevents the crash from occurring.

BUG=478215
Review URL: https://codereview.chromium.org/1072143003

Cr-Commit-Position: refs/heads/master@{#326371}
(cherry picked from commit 08f40f1daf017ec5ca8a0e6e6b977ab33bff69f9)

Committed: https://chromium.googlesource.com/chromium/src/+/1a40423aeccc0b1ae7bebb6a1e3a62ac7b91b52b

[jeremyim, 2015-04-24 18:27:45]

Committed patchset #1 (id:1) manually as
1a40423aeccc0b1ae7bebb6a1e3a62ac7b91b52b.