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Initial Managed Mode extension API, supporting querying the setting and a stub for enabling the mode.

BUG=115447, 115448
TEST=covered by automated tests (browser_tests --gtest_filter=ExtensionApiTest.ManagedMode*)

Review URL: http://codereview.chromium.org/9566007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@125218 0039d316-1c4b-4281-b951-d872f2087c98