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This change changes a menu item "Ask Google for suggestions" to a check item as suggested in privacy review.

BUG=110362
TEST=browser_tests --gtest_filter=SpellingMenuObserverTest.EnableSpellingService

Review URL: http://codereview.chromium.org/9562002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@124931 0039d316-1c4b-4281-b951-d872f2087c98