Re-committing http://codereview.chromium.org/6803005/ after fixing multi-dll build:

third_party/libphonenumber/cpp/src/default_logger.cc

+// Copyright (C) 2011 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Author: Philippe Liard
+
+#include <iostream>
+
+#include "default_logger.h"
+
+using std::cerr;
+using std::cout;
+using std::endl;
+
+namespace i18n {
+namespace phonenumbers {
+
+DefaultLogger::DefaultLogger(LogLevel level) : level_(level) {}
+
+DefaultLogger::~DefaultLogger() {}
+
+void DefaultLogger::Fatal(const string& msg) const {
+  if (level_ >= LOG_FATAL) {
+    cerr << "FATAL libphonenumber " << msg << endl;
+  }
+}
+
+void DefaultLogger::Error(const string& msg) const {
+  if (level_ >= LOG_ERROR) {
+    cerr << "ERROR libphonenumber " << msg << endl;
+  }
+}
+
+void DefaultLogger::Warning(const string& msg) const {
+  if (level_ >= LOG_WARNING) {
+    cerr << "WARNING libphonenumber " << msg << endl;
+  }
+}
+
+void DefaultLogger::Info(const string& msg) const {
+  if (level_ >= LOG_INFO) {
+    cout << "INFO libphonenumber " << msg << endl;
+  }
+}
+
+void DefaultLogger::Debug(const string& msg) const {
+  if (level_ >= LOG_DEBUG) {
+    cout << "DEBUG libphonenumber " << msg << endl;
+  }
+}
+
+}  // namespace phonenumbers
+}  // namespace i18n