GitLab

- Some buttons were missing the "secondary-button"/"cancel-button" class.
- removing rule-lines
- remove unnecessary controls

BUG=684152
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2668163002
Cr-Commit-Position: refs/heads/master@{#447923}