[Sync] Refactoring of sync integration test checkers to remove boilerplate await methods.

chrome/browser/sync/test/integration/performance/sync_timing_helper.h

 // Copyright (c) 2012 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_PERFORMANCE_SYNC_TIMING_HELPER_H_
 #define CHROME_BROWSER_SYNC_TEST_INTEGRATION_PERFORMANCE_SYNC_TIMING_HELPER_H_
 
 #include <string>
 #include <vector>
 
-#include "base/macros.h"
-
 namespace base {
 class TimeDelta;
 }
 
 class ProfileSyncServiceHarness;
 
-class SyncTimingHelper {
- public:
-  SyncTimingHelper();
-  ~SyncTimingHelper();
+namespace sync_timing_helper {
 
-  // Returns the time taken for |client| to complete a single sync cycle.
-  static base::TimeDelta TimeSyncCycle(ProfileSyncServiceHarness* client);
+// Returns the time taken for |client| to complete a single sync cycle.
+base::TimeDelta TimeSyncCycle(ProfileSyncServiceHarness* client);
 
-  // Returns the time taken for both |client| and |partner| to complete a sync
-  // cycle.
-  static base::TimeDelta TimeMutualSyncCycle(
-      ProfileSyncServiceHarness* client, ProfileSyncServiceHarness* partner);
+// Returns the time taken for both |client| and |partner| to complete a sync
+// cycle.
+base::TimeDelta TimeMutualSyncCycle(ProfileSyncServiceHarness* client,
+                                    ProfileSyncServiceHarness* partner);
 
-  // Returns the time taken for all clients in |clients| to complete their
-  // respective sync cycles.
-  static base::TimeDelta TimeUntilQuiescence(
-      std::vector<ProfileSyncServiceHarness*>& clients);
+// Returns the time taken for all clients in |clients| to complete their
+// respective sync cycles.
+base::TimeDelta TimeUntilQuiescence(
+    const std::vector<ProfileSyncServiceHarness*>& clients);
 
-  // Print a timing measurement in a format appropriate for the chromium perf
-  // dashboard.  Simplified version of methods defined in
-  // chrome/test/ui/ui_perf_test.{h,cc}.
-  static void PrintResult(const std::string& measurement,
-                          const std::string& trace,
-                          const base::TimeDelta& dt);
+// Print a timing measurement in a format appropriate for the chromium perf
+// dashboard.  Simplified version of methods defined in
+// chrome/test/ui/ui_perf_test.{h,cc}.
+void PrintResult(const std::string& measurement,
+                 const std::string& trace,
+                 const base::TimeDelta& dt);
 
- private:
-  DISALLOW_COPY_AND_ASSIGN(SyncTimingHelper);
-};
+}  // namespace sync_timing_helper
 
 #endif  // CHROME_BROWSER_SYNC_TEST_INTEGRATION_PERFORMANCE_SYNC_TIMING_HELPER_H_