[Sync] Fix namespaces for the browser_sync component.

chrome/browser/sync/test/integration/quiesce_status_change_checker.h

 // Copyright 2014 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 CHROME_BROWSER_SYNC_TEST_INTEGRATION_QUIESCE_STATUS_CHANGE_CHECKER_H_
 #define CHROME_BROWSER_SYNC_TEST_INTEGRATION_QUIESCE_STATUS_CHANGE_CHECKER_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/time/time.h"
 #include "chrome/browser/sync/test/integration/status_change_checker.h"
 
+class ProgressMarkerWatcher;
+
+namespace browser_sync {
 class ProfileSyncService;
-class ProgressMarkerWatcher;
+}  // namespace browser_sync
 
 // Waits until all provided clients have finished committing any unsynced items
 // and downloading each others' udpates.
 //
 // This requires that "self-notifications" be enabled.  Otherwise the clients
 // will not fetch the latest progress markers on their own, and the latest
 // progress markers are needed to confirm that clients are in sync.
 //
 // There is a race condition here.  If we manage to perform the check at
 // precisely the wrong time, we could end up seeing stale snapshot state
 // (crbug.com/95742), which would make us think that the client has finished
 // syncing when it hasn't.  In practice, this race is rare enough that it
 // doesn't cause test failures.
 class QuiesceStatusChangeChecker : public StatusChangeChecker {
  public:
   explicit QuiesceStatusChangeChecker(
-      std::vector<ProfileSyncService*> services);
+      std::vector<browser_sync::ProfileSyncService*> services);
   ~QuiesceStatusChangeChecker() override;
 
   // Blocks until all clients have quiesced or we time out.
   void Wait();
 
   // A callback function for some helper objects.
-  void OnServiceStateChanged(ProfileSyncService* service);
+  void OnServiceStateChanged(browser_sync::ProfileSyncService* service);
 
   // Implementation of StatusChangeChecker.
   bool IsExitConditionSatisfied() override;
   std::string GetDebugMessage() const override;
 
  private:
-  std::vector<ProfileSyncService*> services_;
+  std::vector<browser_sync::ProfileSyncService*> services_;
   ScopedVector<ProgressMarkerWatcher> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(QuiesceStatusChangeChecker);
 };
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_QUIESCE_STATUS_CHANGE_CHECKER_H_