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[Presentation API] Resolve PresentationRequest::reconnect() with existing presentation connection if such connection exists

Check if any presentation connection with specific presentationUrl and presentationId exists in current browsing context. If so, resolve reconnect() with existing connection instead of creating a new connection.

BUG=677540

Review-Url: https://codereview.chromium.org/2602523002
Cr-Commit-Position: refs/heads/master@{#441462}