Reverting 28993.

base/string_util.h

Index: base/string_util.h
===================================================================
--- base/string_util.h	(revision 28993)
+++ base/string_util.h	(working copy)
@@ -120,7 +120,6 @@
 const string16& EmptyString16();
 
 extern const wchar_t kWhitespaceWide[];
-extern const char16 kWhitespaceUTF16[];
 extern const char kWhitespaceASCII[];
 
 // Removes characters in trim_chars from the beginning and end of input.
@@ -128,9 +127,6 @@
 bool TrimString(const std::wstring& input,
                 const wchar_t trim_chars[],
                 std::wstring* output);
-bool TrimString(const string16& input,
-                const char16 trim_chars[],
-                string16* output);
 bool TrimString(const std::string& input,
                 const char trim_chars[],
                 std::string* output);
@@ -151,9 +147,6 @@
 TrimPositions TrimWhitespace(const std::wstring& input,
                              TrimPositions positions,
                              std::wstring* output);
-TrimPositions TrimWhitespace(const string16& input,
-                             TrimPositions positions,
-                             string16* output);
 TrimPositions TrimWhitespaceASCII(const std::string& input,
                                   TrimPositions positions,
                                   std::string* output);