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Also, move some URL constants to url_constants.h/cc.

BUG=103324
TEST=Go to chrome://settings/personal. Sign in to sync. Choose "Sync Everything". The learn more link should go to http://...answer=185277.


Review URL: http://codereview.chromium.org/8589014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114070 0039d316-1c4b-4281-b951-d872f2087c98