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

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

Index: third_party/libaddressinput/chromium/cpp/src/util/cctype_tolower_equal.cc
diff --git a/third_party/libaddressinput/chromium/cpp/src/util/cctype_tolower_equal.cc b/third_party/libaddressinput/chromium/cpp/src/util/cctype_tolower_equal.cc
new file mode 100644
index 0000000000000000000000000000000000000000..819138f617015481de9ec55178febc3e27199604
--- /dev/null
+++ b/third_party/libaddressinput/chromium/cpp/src/util/cctype_tolower_equal.cc
@@ -0,0 +1,44 @@
+// 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.
+
+#include "cctype_tolower_equal.h"
+
+#include <algorithm>
+#include <cctype>
+#include <functional>
+#include <string>
+
+namespace i18n {
+namespace addressinput {
+
+namespace {
+
+struct EqualToTolowerChar
+    : public std::binary_function<std::string::value_type,
+                                  std::string::value_type, bool> {
+  result_type operator()(first_argument_type a, second_argument_type b) const {
+    return std::tolower(a) == std::tolower(b);
+  }
+};
+
+}  // namespace
+
+EqualToTolowerString::result_type EqualToTolowerString::operator()(
+    const first_argument_type& a, const second_argument_type& b) const {
+  return a.size() == b.size() &&
+         std::equal(a.begin(), a.end(), b.begin(), EqualToTolowerChar());
+}
+
+}  // addressinput
+}  // i18n