Remove obsolete include from site_engagement_service.cc

Bug: 775390
Change-Id: I10ed76b52ca4b3c544a69ce5aa99ed7be1e262d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538362
Auto-Submit: Evan Stade <estade@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827805}

chrome/browser/engagement/site_engagement_service.cc

@@ -18,7 +18,6 @@
 #include "base/time/default_clock.h"
 #include "base/time/time.h"
 #include "base/values.h"
-#include "chrome/browser/banners/app_banner_settings_helper.h"
 #include "chrome/browser/content_settings/host_content_settings_map_factory.h"
 #include "chrome/browser/engagement/site_engagement_helper.h"
 #include "chrome/browser/engagement/site_engagement_metrics.h"