[Sync] Fix namespaces for the sync_sessions component.

ios/chrome/browser/sync/ios_chrome_sync_client.mm

 // 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.
 
 #include "ios/chrome/browser/sync/ios_chrome_sync_client.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 88 matching lines @@
   bool ShouldSyncURL(const GURL& url) const override {
     if (url == GURL(kChromeUIHistoryURL)) {
       // The history page is treated specially as we want it to trigger syncable
       // events for UI purposes.
       return true;
     }
     return url.is_valid() && !url.SchemeIs(kChromeUIScheme) &&
            !url.SchemeIsFile();
   }
 
-  browser_sync::SyncedWindowDelegatesGetter* GetSyncedWindowDelegatesGetter()
+  sync_sessions::SyncedWindowDelegatesGetter* GetSyncedWindowDelegatesGetter()
       override {
     return window_delegates_getter_.get();
   }
 
-  std::unique_ptr<browser_sync::LocalSessionEventRouter>
+  std::unique_ptr<sync_sessions::LocalSessionEventRouter>
   GetLocalSessionEventRouter() override {
     syncer::SyncableService::StartSyncFlare flare(
         ios::sync_start_util::GetFlareForSyncableService(
             browser_state_->GetStatePath()));
     return base::MakeUnique<IOSChromeLocalSessionEventRouter>(browser_state_,
                                                               this, flare);
   }
 
  private:
   ios::ChromeBrowserState* const browser_state_;
-  const std::unique_ptr<browser_sync::SyncedWindowDelegatesGetter>
+  const std::unique_ptr<sync_sessions::SyncedWindowDelegatesGetter>
       window_delegates_getter_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncSessionsClientImpl);
 };
 
 }  // namespace
 
 IOSChromeSyncClient::IOSChromeSyncClient(ios::ChromeBrowserState* browser_state)
     : browser_state_(browser_state),
       sync_sessions_client_(new SyncSessionsClientImpl(browser_state)),
@@ skipping 154 matching lines @@
     }
     case syncer::TYPED_URLS: {
       history::HistoryService* history =
           ios::HistoryServiceFactory::GetForBrowserState(
               browser_state_, ServiceAccessType::EXPLICIT_ACCESS);
       return history ? history->GetTypedUrlSyncableService()->AsWeakPtr()
                      : base::WeakPtr<syncer::SyncableService>();
     }
     case syncer::FAVICON_IMAGES:
     case syncer::FAVICON_TRACKING: {
-      browser_sync::FaviconCache* favicons =
+      sync_sessions::FaviconCache* favicons =
           IOSChromeProfileSyncServiceFactory::GetForBrowserState(browser_state_)
               ->GetFaviconCache();
       return favicons ? favicons->AsWeakPtr()
                       : base::WeakPtr<syncer::SyncableService>();
     }
     case syncer::ARTICLES: {
       dom_distiller::DomDistillerService* service =
           dom_distiller::DomDistillerServiceFactory::GetForBrowserState(
               browser_state_);
       if (service)
@@ skipping 90 matching lines @@
         IOSChromeProfileSyncServiceFactory::GetForBrowserState(browser_state);
     if (profile_sync_service != nullptr) {
       const sync_driver::DeviceInfoTracker* tracker =
           profile_sync_service->GetDeviceInfoTracker();
       if (tracker != nullptr) {
         trackers->push_back(tracker);
       }
     }
   }
 }