[Sync] Put everything in sync/api into csync namespace

sync/api/sync_error.cc

 // 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.
 
 #include "sync/api/sync_error.h"
 
 #include <ostream>
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "sync/internal_api/public/syncable/model_type.h"
 
+namespace csync {
+
 SyncError::SyncError() {
   Clear();
 }
 
 SyncError::SyncError(const tracked_objects::Location& location,
                      const std::string& message,
                      syncable::ModelType type) {
   Init(location, message, type);
   PrintLogError();
 }
@@ skipping 76 matching lines @@
   LAZY_STREAM(logging::LogMessage(location_->file_name(),
                                   location_->line_number(),
                                   logging::LOG_ERROR).stream(),
               LOG_IS_ON(ERROR))
       << syncable::ModelTypeToString(type_) << ", Sync Error: " << message_;
 }
 
 void PrintTo(const SyncError& sync_error, std::ostream* os) {
   *os << sync_error.ToString();
 }
+
+}  // namespace csync
+