Remove Connect method from DevToolsClient

ChromeDriver is going to switch to communication over pipes.
The method Connect makes no sense in such a setup.

Bug: chromedriver:3480
Change-Id: I905a57f508cc2fcbcf796ee8ebe776443812ab9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4521485


Reviewed-by: Mathias Bynens <mathias@chromium.org>
Commit-Queue: Vladimir Nechaev <nechaev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1147159}