Remove ChattyServer ipc_tests, which are slow & unnecessary.

These tests were added to guard against chatty synchronous IPC causing
Windows' PostMessage() limit being reached, and causing messages to be
dropped.

Since Chrome IPC now runs over Mojo, and our message pumps do not call
PostMessage() on each task, and these tests are slow and timeout on
Android & Fuchsia ARM64, just remove the tests.

Bug: 734791, 339980
Change-Id: I26c105f3685995e24011bbc90ed9a391833ec4e2
Reviewed-on: https://chromium-review.googlesource.com/c/1424162
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625053}
6 files changed