Consolidate most of net/'s icu_string_conversions.h dependencies.

net/base/net_string_util.h

+// Copyright 2014 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.
+
+#ifndef NET_BASE_NET_STRING_UTIL_H__
+#define NET_BASE_NET_STRING_UTIL_H__
+
+#include <string>
+
+#include "base/strings/string16.h"
+
+// String conversion functions.  By default, they're implemented with ICU, but
+// when building with USE_ICU_ALTERNATIVES, they use platform functions instead.
+
+namespace net {
+
+// Converts |text| using |charset| to UTF-8, and writes it to |output|.
+// On failure, returns false and |output| is cleared.
+bool ConvertToUtf8(const std::string& text, const char* charset,
+                   std::string* output);
+
+// Converts |text| using |charset| to UTF-8, normalizes the result, and writes
+// it to |output|.  On failure, returns false and |output| is cleared.
+bool ConvertToUtf8AndNormalize(const std::string& text, const char* charset,
+                               std::string* output);
+
+// Converts |text| encoded in Latin-1 to UTF-8, normalizes the result, and
+// writes it to |output|.  On failure, returns false and |output| is cleared.
+bool ConvertLatin1ToUtf8AndNormalize(const std::string& text,
+                                     std::string* output);
+
+// Converts |text| using |charset| to UTF-16, and writes it to |output|.
+// On failure, returns false and |output| is cleared.
+bool ConvertToUTF16(const std::string& text, const char* charset,
+                    base::string16* output);
+
+// Converts |text| encoded in Latin-1 to UTF-16, and writes it to |output|.
+// On failure, returns false and |output| is cleared.
+bool ConvertLatin1ToUTF16(const std::string& text, base::string16* output);
+
+}  // namespace net
+
+#endif  // NET_BASE_NET_STRING_UTIL_H__