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EnhancedBookmarkBridge was previously initialized by a native pointer of
the native BookmarkModel, which was a hack to make it to component
folder.  Now since it has been moved to chrome/browser, it should be
initialized by profile.

BUG=415817

Review URL: https://codereview.chromium.org/598593007

Cr-Commit-Position: refs/heads/master@{#297265}