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Chrome OS with SplitSettingsSync will use this control to show sync
status, just like other platforms.

Linux, syncing (unchanged):
https://screenshot.googleplex.com/t74uFT5iEsL

Linux, not syncing (unchanged):
https://screenshot.googleplex.com/SJGC3rbtGnw

Chrome OS, pre-SplitSettingsSync (unchanged):
https://screenshot.googleplex.com/EKZDSEqVBYy

Chrome OS, post-SplitSettingsSync (new):
https://screenshot.googleplex.com/fLYerpP60rg

Remove some unused references to diceEnabled_.

TODO: Make the "turn off" button actually work.

Bug: 1013466
Test: browser_tests
Change-Id: I2bb50ffdd7bcb408a13885740440ff752ff2fd2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2003758
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733860}