[Sync] Fix namespaces for the browser_sync component.

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

Index: chrome/browser/sync/test/integration/single_client_status_change_checker.h
diff --git a/chrome/browser/sync/test/integration/single_client_status_change_checker.h b/chrome/browser/sync/test/integration/single_client_status_change_checker.h
index 118cdc0346025644f586bc30e4c5aad7b8cf5685..eb05d511df02cbc1bfc29c0b179ae63456f31bf4 100644
--- a/chrome/browser/sync/test/integration/single_client_status_change_checker.h
+++ b/chrome/browser/sync/test/integration/single_client_status_change_checker.h
@@ -10,7 +10,9 @@
 #include "chrome/browser/sync/test/integration/multi_client_status_change_checker.h"
 #include "components/sync/driver/sync_service_observer.h"
 
+namespace browser_sync {
 class ProfileSyncService;
+}  // namespace browser_sync
 
 // This class provides some common functionality for StatusChangeCheckers that
 // observe only one ProfileSyncService.  This class is abstract.  Its
@@ -18,7 +20,8 @@ class ProfileSyncService;
 class SingleClientStatusChangeChecker
   : public MultiClientStatusChangeChecker {
  public:
-  explicit SingleClientStatusChangeChecker(ProfileSyncService* service);
+  explicit SingleClientStatusChangeChecker(
+      browser_sync::ProfileSyncService* service);
   ~SingleClientStatusChangeChecker() override;
 
   // StatusChangeChecker implementations and stubs.
@@ -26,7 +29,7 @@ class SingleClientStatusChangeChecker
   std::string GetDebugMessage() const override = 0;
 
  protected:
-  ProfileSyncService* service();
+  browser_sync::ProfileSyncService* service();
 };
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_SINGLE_CLIENT_STATUS_CHANGE_CHECKER_H_