Move host to core/host

R=aerotwist@chromium.org

No-Presubmit: true
Bug: 1187573
Change-Id: I836c98bbd5b05f4595e28cedfaf957a6f47c7807
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2799755
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
Auto-Submit: Tim van der Lippe <tvanderlippe@chromium.org>
Reviewed-by: Paul Lewis <aerotwist@chromium.org>
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 40fb6da..b142c6d 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -139,7 +139,7 @@
         input_api.os_path.join(input_api.PresubmitLocalPath(), 'front_end',
                                'main', 'MainImpl.js'),
         input_api.os_path.join(input_api.PresubmitLocalPath(), 'front_end',
-                               'host', 'UserMetrics.ts')
+                               'core', 'host', 'UserMetrics.ts')
     ]
     affected_main_files = _getAffectedFiles(input_api,
                                             experiment_telemetry_files, [],