Bring back RefreshElevationPolicy to avoid prompts on Vista and Win7

TEST=upgrade from older version, it should not prompt to load page
in chrome frame on Vista and Windows 7.
BUG=51747

Review URL: http://codereview.chromium.org/3153006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@55782 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed