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- Rename the 'no thanks' and 'continue' buttons to 'skip' and 'next'.
- Refactor the code.

BUG=b/63909126
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2984023002
Cr-Commit-Position: refs/heads/master@{#488741}