Reland of "Use address_data.h from upstream libaddressinput".

third_party/libaddressinput/chromium/cpp/src/util/cctype_tolower_equal.h

Index: third_party/libaddressinput/chromium/cpp/src/util/cctype_tolower_equal.h
diff --git a/third_party/libaddressinput/chromium/cpp/src/util/cctype_tolower_equal.h b/third_party/libaddressinput/chromium/cpp/src/util/cctype_tolower_equal.h
new file mode 100644
index 0000000000000000000000000000000000000000..106087e8c44ddd67552efeae063a91ba2663971f
--- /dev/null
+++ b/third_party/libaddressinput/chromium/cpp/src/util/cctype_tolower_equal.h
@@ -0,0 +1,35 @@
+// Copyright (C) 2014 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.
+
+#ifndef I18N_ADDRESSINPUT_UTIL_CCTYPE_TOLOWER_EQUAL_H_
+#define I18N_ADDRESSINPUT_UTIL_CCTYPE_TOLOWER_EQUAL_H_
+
+#include <functional>
+#include <string>
+
+namespace i18n {
+namespace addressinput {
+
+// Performs case insensitive comparison of |a| and |b| by calling std::tolower()
+// from <cctype>.
+struct EqualToTolowerString
+    : public std::binary_function<std::string, std::string, bool> {
+  result_type operator()(const first_argument_type& a,
+                         const second_argument_type& b) const;
+};
+
+}  // addressinput
+}  // i18n
+
+#endif  // I18N_ADDRESSINPUT_UTIL_CCTYPE_TOLOWER_EQUAL_H_