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When the translate client was refactored to be managed by the translate driver
and to use a RenderFrameHost instead of a RenderViewHost, it accidentally broke
non-static CLD initialization because the IPC messages being received by the
translate driver were not being passed into the CLD data provider. This change
moves the relevant code from the translate client into the translate driver and
restores functionality.

BUG=571016
TBR=droger@chromium.org

Review URL: https://codereview.chromium.org/1543533002

Cr-Commit-Position: refs/heads/master@{#369396}