Pull in ASCII<->UTF16 from Chromium

base/strings/utf_string_conversions.h

Index: base/strings/utf_string_conversions.h
diff --git a/base/strings/utf_string_conversions.h b/base/strings/utf_string_conversions.h
index b536b03c7df50f51b10bf55ac7b3c27ac9adb09a..fb2323f1cb59748c73bd57785b85ec431cf6d42b 100644
--- a/base/strings/utf_string_conversions.h
+++ b/base/strings/utf_string_conversions.h
@@ -8,6 +8,7 @@
 #include <string>
 
 #include "base/strings/string16.h"
+#include "base/strings/string_piece.h"
 
 namespace base {
 
@@ -15,7 +16,9 @@ bool UTF8ToUTF16(const char* src, size_t src_len, string16* output);
 string16 UTF8ToUTF16(const std::string& utf8);
 bool UTF16ToUTF8(const char16* src, size_t src_len, std::string* output);
 std::string UTF16ToUTF8(const string16& utf16);
+string16 ASCIIToUTF16(const StringPiece& ascii);
+std::string UTF16ToASCII(const string16& utf16);
 
-}  // namespace
+}  // namespace base
 
 #endif  // MINI_CHROMIUM_BASE_STRINGS_UTF_STRING_CONVERSIONS_H_