Add support for the extended header parameter syntax in Content-Disposition h...

base/i18n/icu_string_conversions.h

Index: base/i18n/icu_string_conversions.h
===================================================================
--- base/i18n/icu_string_conversions.h	(revision 64006)
+++ base/i18n/icu_string_conversions.h	(working copy)
@@ -64,6 +64,12 @@
                     OnStringConversionError::Type on_error,
                     std::wstring* wide);
 
+// Converts from any codepage to UTF-8 and ensures the resulting UTF-8 is
+// normalized.
+bool ConvertToUtf8AndNormalize(const std::string& text,
+                               const std::string& charset,
+                               std::string* result);
+
 }  // namespace base
 
 #endif  // BASE_I18N_ICU_STRING_CONVERSIONS_H_