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This CL moves the parsing JSON task from UI thread to blocking pool.
Along the change, thin struct OnParseResourceListCompletedParams is introduced
for memory management and adapt callback arguments.

BUG=165088
TEST=Ran unit_tests and chromeos_unittests.


Review URL: https://chromiumcodereview.appspot.com/11783025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175793 0039d316-1c4b-4281-b951-d872f2087c98