Add utf_string_conversions to base namespace.

base/utf_string_conversions.h

Index: base/utf_string_conversions.h
diff --git a/base/utf_string_conversions.h b/base/utf_string_conversions.h
index 5a391faecaeb0fa0428a675e3ca2bc52df77dc5c..83cd03b675ef40cd7987fc14347e4f74fdd03b54 100644
--- a/base/utf_string_conversions.h
+++ b/base/utf_string_conversions.h
@@ -11,6 +11,8 @@
 #include "base/string16.h"
 #include "base/string_piece.h"
 
+namespace base {
+
 // These convert between UTF-8, -16, and -32 strings. They are potentially slow,
 // so avoid unnecessary conversions. The low-level versions return a boolean
 // indicating whether the conversion was 100% valid. In this case, it will still
@@ -55,4 +57,23 @@ BASE_EXPORT std::string UTF16ToUTF8(const string16& utf16);
 BASE_EXPORT std::wstring ASCIIToWide(const base::StringPiece& ascii);
 BASE_EXPORT string16 ASCIIToUTF16(const base::StringPiece& ascii);
 
+}  // namespace base
+
+// TODO(brettw) remove these usings once all code has been converted to using
+// the namespaces.
+using base::WideToUTF8;
+using base::WideToUTF8;
+using base::UTF8ToWide;
+using base::UTF8ToWide;
+using base::WideToUTF16;
+using base::WideToUTF16;
+using base::UTF16ToWide;
+using base::UTF16ToWide;
+using base::UTF8ToUTF16;
+using base::UTF8ToUTF16;
+using base::UTF16ToUTF8;
+using base::UTF16ToUTF8;
+using base::ASCIIToWide;
+using base::ASCIIToUTF16;
+
 #endif  // BASE_UTF_STRING_CONVERSIONS_H_