[Sync] Move //components/sync to the syncer namespace.

components/sync/device_info/device_count_metrics_provider_unittest.cc

 // Copyright 2016 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 "components/sync/device_info/device_count_metrics_provider.h"
 
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/test/histogram_tester.h"
 #include "components/sync/device_info/device_info.h"
 #include "components/sync/device_info/device_info_tracker.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-namespace sync_driver {
+namespace syncer {
 
 namespace {
 
 class FakeTracker : public DeviceInfoTracker {
  public:
   explicit FakeTracker(const int count) : count_(count) {}
 
   // DeviceInfoTracker
   bool IsSyncing() const override { return false; }
   std::unique_ptr<DeviceInfo> GetDeviceInfo(
@@ skipping 66 matching lines @@
   TestProvider(0);
 }
 
 TEST_F(DeviceCountMetricsProviderTest, VeryLarge) {
   AddTracker(123456789);
   TestProvider(100);
 }
 
 }  // namespace
 
-}  // namespace sync_driver
+}  // namespace syncer