[Sync] Fix namespaces for the sync_sessions component.

chrome/browser/sync/sessions/notification_service_sessions_router.h

Index: chrome/browser/sync/sessions/notification_service_sessions_router.h
diff --git a/chrome/browser/sync/sessions/notification_service_sessions_router.h b/chrome/browser/sync/sessions/notification_service_sessions_router.h
index d4a2feec6c080ef33ce8b318bae85a50aad6757f..d1cf812b9908fce4f275634b496870ce3d5f7a95 100644
--- a/chrome/browser/sync/sessions/notification_service_sessions_router.h
+++ b/chrome/browser/sync/sessions/notification_service_sessions_router.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_SYNC_SESSIONS_NOTIFICATION_SERVICE_SESSIONS_ROUTER_H_
 #define CHROME_BROWSER_SYNC_SESSIONS_NOTIFICATION_SERVICE_SESSIONS_ROUTER_H_
 
+#include <memory>
 #include <set>
 
 #include "base/callback_list.h"
@@ -30,7 +31,7 @@ namespace browser_sync {
 // A SessionsSyncManager::LocalEventRouter that drives session sync via
 // the NotificationService.
 class NotificationServiceSessionsRouter
-    : public LocalSessionEventRouter,
+    : public sync_sessions::LocalSessionEventRouter,
       public content::NotificationObserver {
  public:
   NotificationServiceSessionsRouter(
@@ -46,7 +47,8 @@ class NotificationServiceSessionsRouter
                const content::NotificationDetails& details) override;
 
   // SessionsSyncManager::LocalEventRouter implementation.
-  void StartRoutingTo(LocalSessionEventHandler* handler) override;
+  void StartRoutingTo(
+      sync_sessions::LocalSessionEventHandler* handler) override;
   void Stop() override;
 
  private:
@@ -65,7 +67,7 @@ class NotificationServiceSessionsRouter
   void OnFaviconsChanged(const std::set<GURL>& page_urls,
                          const GURL& icon_url);
 
-  LocalSessionEventHandler* handler_;
+  sync_sessions::LocalSessionEventHandler* handler_;
   content::NotificationRegistrar registrar_;
   Profile* const profile_;
   sync_sessions::SyncSessionsClient* const sessions_client_;