Revert "By default use current code page on Windows for decoding string"

runtime/bin/process.cc

Index: runtime/bin/process.cc
diff --git a/runtime/bin/process.cc b/runtime/bin/process.cc
index 822c4545eff0d6d4a0f842a0277c95c812569658..b786ddb0e37ffb73753ecf19296e8b02dd1bf6af 100644
--- a/runtime/bin/process.cc
+++ b/runtime/bin/process.cc
@@ -3,7 +3,6 @@
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/dartutils.h"
-#include "bin/io_buffer.h"
 #include "bin/process.h"
 #include "bin/socket.h"
 
@@ -178,38 +177,3 @@ Dart_Handle Process::SetProcessIdNativeField(Dart_Handle process,
                                              intptr_t pid) {
   return Dart_SetNativeInstanceField(process, kProcessIdNativeField, pid);
 }
-
-
-void FUNCTION_NAME(SystemEncodingToString)(Dart_NativeArguments args) {
-  Dart_EnterScope();
-  Dart_Handle bytes = Dart_GetNativeArgument(args, 0);
-  intptr_t bytes_length = 0;
-  Dart_Handle result = Dart_ListLength(bytes, &bytes_length);
-  if (Dart_IsError(result)) Dart_PropagateError(result);
-  uint8_t* buffer = new uint8_t[bytes_length];
-  result = Dart_ListGetAsBytes(bytes, 0, buffer, bytes_length);
-  if (Dart_IsError(result)) {
-    delete[] buffer;
-    Dart_PropagateError(result);
-  }
-  char* str =
-      StringUtils::SystemStringToUtf8(reinterpret_cast<char*>(buffer));
-  Dart_SetReturnValue(args, DartUtils::NewString(str));
-  if (str != reinterpret_cast<char*>(buffer)) free(str);
-  Dart_ExitScope();
-}
-
-
-void FUNCTION_NAME(StringToSystemEncoding)(Dart_NativeArguments args) {
-  Dart_EnterScope();
-  Dart_Handle str = Dart_GetNativeArgument(args, 0);
-  const char* utf8 = DartUtils::GetStringValue(str);
-  const char* system_string = StringUtils::Utf8ToSystemString(utf8);
-  int external_length = strlen(system_string);
-  uint8_t* buffer = NULL;
-  Dart_Handle external_array = IOBuffer::Allocate(external_length, &buffer);
-  memmove(buffer, system_string, external_length);
-  if (utf8 != system_string) free(const_cast<char*>(system_string));
-  Dart_SetReturnValue(args, external_array);
-  Dart_ExitScope();
-}