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MD Bookmarks is switching to a new data store layer to help with binding
data changes to UI elements. This CL ties the new data store to the
existing UI elements.

Note that the new data store is currently missing a few features:
* Item selection
* Search
* URL routing

These features are broken by this CL (there are no user-visible feature
regressions, since this is all behind a runtime flag), but will be added
back in soon.

BUG=697706
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2735953002
Cr-Commit-Position: refs/heads/master@{#455981}