(Copy of previous CL that existed in a client I lost)
(Copy of previous CL that existed in a client I lost)

- Don't treat the body of an "authentication required" response as a valid dictionary!
- In the event of a 200 status code, check the response actually looks like a dictionary.

BUG=24486
TEST=Verified the appearance of new dictionaries after changing spell-check language; verified spell-checking on new dictionaries.
TBR=sidchat

Review URL: http://codereview.chromium.org/295014

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@29471 0039d316-1c4b-4281-b951-d872f2087c98

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