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This CL converts base::Callback in the bookmarks/ folder.

This is a code health CL, no behavior change.

Bug: 1007635
Change-Id: I5a1564ef948a5f1fb90117906918e65e0c8dc602
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2274157
Auto-Submit: Xida Chen <xidachen@chromium.org>
Commit-Queue: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784216}