[uber page] Migrate remaining Personal options into Browser options.

- Move UI and backing code for account (cros), themes, import data.
- Move some code for the sync section that was missed in a previous migration.
- Minor reorganizations to match mocks.

BUG=107468,107484
Review URL: http://codereview.chromium.org/9181013

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@117299 0039d316-1c4b-4281-b951-d872f2087c98
18 files changed