[Sync] Fix namespaces for the sync_sessions component.

chrome/browser/sync/sessions/sync_sessions_metrics_android.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chrome/browser/sync/sync_sessions_metrics_android.h"
+#include "chrome/browser/sync/sessions/sync_sessions_metrics_android.h"
 
 #include <string>
 
 #include "base/metrics/field_trial.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
 #include "components/browser_sync/browser/profile_sync_service.h"
 #include "components/sync_sessions/sessions_sync_manager.h"
 #include "components/sync_sessions/sync_sessions_metrics.h"
@@ skipping 15 matching lines @@
   // valid data but at the cost of a much smaller sample size.
   const std::string group_name =
       base::FieldTrialList::FindFullName("PageRevisitInstrumentation");
   bool shouldInstrument = group_name == "Enabled";
   if (shouldInstrument) {
     Profile* profile = ProfileManager::GetActiveUserProfile();
     if (profile) {
       ProfileSyncService* sync =
           ProfileSyncServiceFactory::GetForProfile(profile);
       if (sync) {
-        browser_sync::SessionsSyncManager* sessions =
-            static_cast<browser_sync::SessionsSyncManager*>(
+        sync_sessions::SessionsSyncManager* sessions =
+            static_cast<sync_sessions::SessionsSyncManager*>(
                 sync->GetSessionsSyncableService());
         if (sessions) {
           sync_sessions::SyncSessionsMetrics::RecordYoungestForeignTabAgeOnNTP(
               sessions);
         }
       }
     }
   }
 }