Move UTF16ToASCII, remove WideToASCII.

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 fa245ea0b45a001d2866500eee9ead8f2ea5149b..242cd661c0d97f425e5a2d5576bab5ea7c9d64b7 100644
--- a/base/strings/utf_string_conversions.h
+++ b/base/strings/utf_string_conversions.h
@@ -44,6 +44,10 @@ BASE_EXPORT std::string UTF16ToUTF8(const string16& utf16);
 BASE_EXPORT std::wstring ASCIIToWide(const StringPiece& ascii);
 BASE_EXPORT string16 ASCIIToUTF16(const StringPiece& ascii);
 
+// Converts to 7-bit ASCII by truncating. The result must be known to be ASCII
+// beforehand.
+BASE_EXPORT std::string UTF16ToASCII(const string16& utf16);
+
 }  // namespace base
 
 // We are trying to get rid of wstring as much as possible, but it's too big a