Remove mojo::String.

mojo/common/common_type_converters.h

Index: mojo/common/common_type_converters.h
diff --git a/mojo/common/common_type_converters.h b/mojo/common/common_type_converters.h
index bf1e723b84d2eec6a1076d088bbd4f9d3938a806..b4ec0a933da7b15769b28e2bab29c5e534fee781 100644
--- a/mojo/common/common_type_converters.h
+++ b/mojo/common/common_type_converters.h
@@ -12,32 +12,11 @@
 #include "base/strings/string_piece.h"
 #include "mojo/common/mojo_common_export.h"
 #include "mojo/public/cpp/bindings/array.h"
-#include "mojo/public/cpp/bindings/string.h"
 #include "mojo/public/cpp/bindings/type_converter.h"
 
 namespace mojo {
 
 template <>
-struct MOJO_COMMON_EXPORT TypeConverter<String, base::StringPiece> {
-  static String Convert(const base::StringPiece& input);
-};
-
-template <>
-struct MOJO_COMMON_EXPORT TypeConverter<base::StringPiece, String> {
-  static base::StringPiece Convert(const String& input);
-};
-
-template <>
-struct MOJO_COMMON_EXPORT TypeConverter<String, base::string16> {
-  static String Convert(const base::string16& input);
-};
-
-template <>
-struct MOJO_COMMON_EXPORT TypeConverter<base::string16, String> {
-  static base::string16 Convert(const String& input);
-};
-
-template <>
 struct MOJO_COMMON_EXPORT TypeConverter<std::string, Array<uint8_t>> {
   static std::string Convert(const Array<uint8_t>& input);
 };