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

third_party/libphonenumber/cpp/src/phonenumber.h

+// Copyright (C) 2009 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
+
+#ifndef I18N_PHONENUMBERS_PHONENUMBER_H_
+#define I18N_PHONENUMBERS_PHONENUMBER_H_
+
+// Helper functions dealing with PhoneNumber and PhoneNumberDesc comparisons.
+
+namespace i18n {
+namespace phonenumbers {
+
+class PhoneNumber;
+class PhoneNumberDesc;
+
+// Compares two phone numbers.
+bool ExactlySameAs(const PhoneNumber& first_number,
+                   const PhoneNumber& second_number);
+
+
+// Compares two phone number descriptions.
+bool ExactlySameAs(const PhoneNumberDesc& first_number_desc,
+                   const PhoneNumberDesc& second_number_desc);
+
+}  // namespace phonenumbers
+}  // namespace i18n
+
+#endif  // I18N_PHONENUMBERS_PHONENUMBER_H_