Implement alternative string conversion functions in net/ on Android,

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 {
 
+extern const char* const kCharsetLatin1;
+
 // 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);
+// Converts |text| using |charset| to UTF-16, and writes it to |output|.
+// Any characters that can not be converted are replaced with U+FFFD.
+bool ConvertToUTF16WithSubstitutions(const std::string& text,
+                                     const char* charset,
+                                     base::string16* output);
 
 }  // namespace net
 
 #endif  // NET_BASE_NET_STRING_UTIL_H__