[Sync] Fix namespaces for the browser_sync component.

components/browser_sync/signin_confirmation_helper.cc

 // Copyright 2015 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/browser_sync/signin_confirmation_helper.h"
 
 #include <memory>
 
 #include "base/strings/string16.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/history/core/browser/history_backend.h"
 #include "components/history/core/browser/history_db_task.h"
 #include "components/history/core/browser/history_service.h"
 #include "components/history/core/browser/history_types.h"
 
+namespace browser_sync {
+
 namespace {
 
 // Determines whether there are any typed URLs in a history backend.
 class HasTypedURLsTask : public history::HistoryDBTask {
  public:
   explicit HasTypedURLsTask(const base::Callback<void(bool)>& cb)
       : has_typed_urls_(false), cb_(cb) {}
 
   bool RunOnDBThread(history::HistoryBackend* backend,
                      history::HistoryDatabase* db) override {
@@ skipping 11 matching lines @@
 
  private:
   ~HasTypedURLsTask() override {}
 
   bool has_typed_urls_;
   base::Callback<void(bool)> cb_;
 };
 
 }  // namespace
 
-namespace sync_driver {
-
 SigninConfirmationHelper::SigninConfirmationHelper(
     history::HistoryService* history_service,
     const base::Callback<void(bool)>& return_result)
     : origin_thread_(base::ThreadTaskRunnerHandle::Get()),
       history_service_(history_service),
       pending_requests_(0),
       return_result_(return_result) {}
 
 SigninConfirmationHelper::~SigninConfirmationHelper() {
   DCHECK(origin_thread_->BelongsToCurrentThread());
@@ skipping 51 matching lines @@
   // result of |true|, otherwise pass the last returned result.
   if (--pending_requests_ == 0 || result) {
     return_result_.Run(result);
 
     // This leaks at shutdown if the HistoryService is destroyed, but
     // the process is going to die anyway.
     delete this;
   }
 }
 
-}  // namespace sync_driver
+}  // namespace browser_sync