GitLab

Updates the ContextualSuggestionsService to call the new
ContextualSuggestionsMetricsReporter to do basic metric
reporting.

BUG=824185

Change-Id: I6db197cd0390abcda1337569e30b2f42961cac0f
Reviewed-on: https://chromium-review.googlesource.com/994709Reviewed-by: Filip Gorski <fgorski@chromium.org>
Commit-Queue: Donn Denman <donnd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548618}