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

chrome/browser/sync/test/integration/migration_waiter.cc

 // 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.
 
 #include "chrome/browser/sync/test/integration/migration_waiter.h"
 
 #include "base/logging.h"
 #include "chrome/browser/sync/test/integration/migration_watcher.h"
 
 MigrationWaiter::MigrationWaiter(syncer::ModelTypeSet expected_types,
@@ skipping 13 matching lines @@
   return watcher_->GetMigratedTypes().HasAll(expected_types_) &&
          !watcher_->HasPendingBackendMigration();
 }
 
 std::string MigrationWaiter::GetDebugMessage() const {
   return "Waiting to migrate (" + ModelTypeSetToString(expected_types_) +
          "); " + "Currently migrated: (" +
          ModelTypeSetToString(watcher_->GetMigratedTypes()) + ")";
 }
 
-void MigrationWaiter::Wait() {
-  if (IsExitConditionSatisfied()) {
-    DVLOG(1) << "Skipping wait: " << GetDebugMessage();
-    return;
-  }
-
-  StartBlockingWait();
-}
-
 void MigrationWaiter::OnMigrationStateChange() {
   CheckExitCondition();
 }