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SharedWorkerRepositoryClientImpl implements classes defined in public/web/
(WebSharedWorkerConnectListener, WebSharedWorkerRepositoryClient) so it is being
moved to core/exported.

SharedWorkerRepositoryClientImpl.cpp did include WebLocalFrameImpl but luckily
enough didn't use it so we could just break this dependency.

BUG=708879

Review-Url: https://codereview.chromium.org/2833693002
Cr-Commit-Position: refs/heads/master@{#468274}