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It broke Drive sync completely.

> Parse Drive API responses all at once in the blocking pool.
> 
> Previous implementation did the parsing of string to base::Value
> on blocking pool, and that of base::Value to specific data types
> either on UI thread or on yet another post to blocking pool.
> 
> The previous implementation is slightly inefficient and moreover
> involves a subtle bug 284244.
> 
> BUG=284244
> 
> Review URL: https://codereview.chromium.org/442193002

TBR=kinaba@chromium.org
BUG=401843

Review URL: https://codereview.chromium.org/449323002

Cr-Commit-Position: refs/heads/master@{#288216}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288216 0039d316-1c4b-4281-b951-d872f2087c98