[Sync] Fix namespaces for the sync_sessions component.

ios/chrome/browser/sync/sessions/ios_chrome_local_session_event_router.h

 // Copyright 2015 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.
 
-#ifndef IOS_CHROME_BROWSER_SYNC_SESSIONS_IOS_CHROME_LOCAL_EVENT_SESSION_ROUTER_H_
-#define IOS_CHROME_BROWSER_SYNC_SESSIONS_IOS_CHROME_LOCAL_EVENT_SESSION_ROUTER_H_
+#ifndef IOS_CHROME_BROWSER_SYNC_SESSIONS_IOS_CHROME_LOCAL_SESSION_EVENT_ROUTER_H_
+#define IOS_CHROME_BROWSER_SYNC_SESSIONS_IOS_CHROME_LOCAL_SESSION_EVENT_ROUTER_H_
 
 #include <stddef.h>
 
 #include <memory>
 #include <set>
 
 #include "base/callback_list.h"
 #include "base/macros.h"
 #include "components/sync/api/syncable_service.h"
 #include "components/sync_sessions/local_session_event_router.h"
 #include "ios/web/public/web_state/global_web_state_observer.h"
 
 class GURL;
 
 namespace ios {
 class ChromeBrowserState;
 }
 
 namespace sync_sessions {
 class SyncSessionsClient;
 }
 
 // A LocalEventRouter that drives session sync via observation of
 // web::WebState-related events.
 class IOSChromeLocalSessionEventRouter
-    : public browser_sync::LocalSessionEventRouter,
+    : public sync_sessions::LocalSessionEventRouter,
       public web::GlobalWebStateObserver {
  public:
   IOSChromeLocalSessionEventRouter(
       ios::ChromeBrowserState* browser_state,
       sync_sessions::SyncSessionsClient* sessions_client_,
       const syncer::SyncableService::StartSyncFlare& flare);
   ~IOSChromeLocalSessionEventRouter() override;
 
   // LocalEventRouter:
-  void StartRoutingTo(browser_sync::LocalSessionEventHandler* handler) override;
+  void StartRoutingTo(
+      sync_sessions::LocalSessionEventHandler* handler) override;
   void Stop() override;
 
   // web::GlobalWebStateObserver:
   void NavigationItemsPruned(web::WebState* web_state,
                              size_t pruned_item_count) override;
   void NavigationItemChanged(web::WebState* web_state) override;
   void NavigationItemCommitted(
       web::WebState* web_state,
       const web::LoadCommittedDetails& load_details) override;
   void PageLoaded(
       web::WebState* web_state,
       web::PageLoadCompletionStatus load_completion_status) override;
   void WebStateDestroyed(web::WebState* web_state) override;
 
  private:
   // Called when a tab is parented.
   void OnTabParented(web::WebState* web_state);
 
   // Called on observation of a change in |web_state|.
   void OnWebStateChange(web::WebState* web_state);
 
   // Called when the favicons for the given page URLs
   // (e.g. http://www.google.com) and the given icon URL (e.g.
   // http://www.google.com/favicon.ico) have changed. It is valid to call
   // OnFaviconsChanged() with non-empty |page_urls| and an empty |icon_url|
   // and vice versa.
   void OnFaviconsChanged(const std::set<GURL>& page_urls, const GURL& icon_url);
 
-  browser_sync::LocalSessionEventHandler* handler_;
+  sync_sessions::LocalSessionEventHandler* handler_;
   ios::ChromeBrowserState* const browser_state_;
   sync_sessions::SyncSessionsClient* const sessions_client_;
   syncer::SyncableService::StartSyncFlare flare_;
 
   std::unique_ptr<base::CallbackList<void(const std::set<GURL>&,
                                           const GURL&)>::Subscription>
       favicon_changed_subscription_;
 
   std::unique_ptr<base::CallbackList<void(web::WebState*)>::Subscription>
       tab_parented_subscription_;
 
   DISALLOW_COPY_AND_ASSIGN(IOSChromeLocalSessionEventRouter);
 };
 
-#endif  // IOS_CHROME_BROWSER_SYNC_SESSIONS_IOS_CHROME_LOCAL_EVENT_SESSION_ROUTER_H_
+#endif  // IOS_CHROME_BROWSER_SYNC_SESSIONS_IOS_CHROME_LOCAL_SESSION_EVENT_ROUTER_H_