GitLab

This CL replaces usage of Binding::WaitForIncomingMethodCall() with
a spin runloop waiting for incoming call or a connection error.
Affected test codes are within:
  components/arc/
  services/shell/

BUG=622438

Review-Url: https://codereview.chromium.org/2135223002
Cr-Commit-Position: refs/heads/master@{#407029}