Remove dependency on mojo bindings
Remove dependency on mojo bindings

Now that http://crbug.com/600384 is fixed we no longer need to depen
on mojo bindings directly.

Review URL: https://codereview.chromium.org/1890703003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#387528}

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