Move the files related to tab_stats_tracker to a new directory

This will allow having owners more familiar with this code for these
files.

Change-Id: Idcb5891a9aed8d499171904273dfd24a7c763008
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2679631
Auto-Submit: Sébastien Marchand <[email protected]>
Commit-Queue: Sébastien Marchand <[email protected]>
Reviewed-by: Gabriel Charette <[email protected]>
Reviewed-by: Oliver Li <[email protected]>
Reviewed-by: Steven Holte <[email protected]>
Cr-Commit-Position: refs/heads/master@{#852447}
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index 13e5d684..a47827b 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -232,7 +232,7 @@
 #include "chrome/browser/gcm/gcm_product_util.h"
 #include "chrome/browser/intranet_redirect_detector.h"
 #include "chrome/browser/media/unified_autoplay_config.h"
-#include "chrome/browser/metrics/tab_stats_tracker.h"
+#include "chrome/browser/metrics/tab_stats/tab_stats_tracker.h"
 #include "chrome/browser/nearby_sharing/common/nearby_share_prefs.h"
 #include "chrome/browser/search/instant_service.h"
 #include "chrome/browser/search/promos/promo_service.h"