Add kkimlabs@ as owner for enhanced bookmark bridges.

Missing enhanced bookmark owners coverage from https://codereview.chromium.org/682103003

NOTRY=true
BUG=None

Review URL: https://codereview.chromium.org/691853003

Cr-Commit-Position: refs/heads/master@{#302173}

chrome/android/java/src/org/chromium/chrome/browser/OWNERS

+per-file EnhancedBookmarksBridge.java=kkimlabs@chromium.org

chrome/browser/android/enhanced_bookmarks/OWNERS

+kkimlabs@chromium.org