Crash if the render process fails to create its IO thread.
Crash if the render process fails to create its IO thread.

We are seeing some latent crashes that I believe are a consequence of this earlier failure. So this change should help clarify what is happening.

A next step would be to determine the particular platform error that caused thread creation to fail.
(However base::PlatformThread doesn't currently expose that).

BUG=109302


Review URL: http://codereview.chromium.org/9122010

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@116750 0039d316-1c4b-4281-b951-d872f2087c98

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