Move UTF16ToASCII, remove WideToASCII.

base/strings/string_util.h

Index: base/strings/string_util.h
diff --git a/base/strings/string_util.h b/base/strings/string_util.h
index c6fe14a65b2c60a26c08837723aa08ed64bb3011..473deaebe87d5bca7556418531856ada2c629c61 100644
--- a/base/strings/string_util.h
+++ b/base/strings/string_util.h
@@ -19,8 +19,6 @@
 #include "base/strings/string16.h"
 #include "base/strings/string_piece.h"  // For implicit conversions.
 
-// Safe standard library wrappers for all platforms.
-
 namespace base {
 
 // C standard-library functions like "strncasecmp" and "snprintf" that aren't
@@ -246,11 +244,6 @@ BASE_EXPORT bool ContainsOnlyChars(const StringPiece16& input,
 #error Define string operations appropriately for your platform
 #endif
 
-// Converts to 7-bit ASCII by truncating. The result must be known to be ASCII
-// beforehand.
-BASE_EXPORT std::string WideToASCII(const std::wstring& wide);
-BASE_EXPORT std::string UTF16ToASCII(const base::string16& utf16);
-
 // Returns true if the specified string matches the criteria. How can a wide
 // string be 8-bit or UTF8? It contains only characters that are < 256 (in the
 // first case) or characters that use only 8-bits and whose 8-bit