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Previously cast runner was using agent_url to connect MetricsRecorder.
That doesn't work correctly: the agent that created the component may
not provide MetricsRecorder. Updated it to use components
incoming_directory. This ensures that MetricsRecorder request is routed
properly to the agent that implements the service.

Bug: b/157669687
Change-Id: I891ebd852278fd98b543076f82562dbcd416005e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360417
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799011}