components: Move user_prefs into user_prefs namespace.

BUG=245050
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Review URL: https://chromiumcodereview.appspot.com/16625004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@205517 0039d316-1c4b-4281-b951-d872f2087c98
25 files changed