Cache ICU collators for Autofill country detection; improve performance on form submit.
Cache ICU collators for Autofill country detection; improve performance on form submit.

BUG=75862
TEST=manual: add a *lot* of autofill addresses to Chromium; fill+submit a form and experience far less of a hang

Review URL: http://codereview.chromium.org/6686026

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@78083 0039d316-1c4b-4281-b951-d872f2087c98

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