Update dart:io to convert strings between UTF8 and current code page

runtime/bin/platform.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/file.h"
 #include "bin/platform.h"
 #include "include/dart_api.h"
 
 
 void FUNCTION_NAME(Platform_NumberOfProcessors)(Dart_NativeArguments args) {
   Dart_EnterScope();
   Dart_SetReturnValue(args, Dart_NewInteger(Platform::NumberOfProcessors()));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(Platform_OperatingSystem)(Dart_NativeArguments args) {
   Dart_EnterScope();
-  Dart_SetReturnValue(args,
-                      Dart_NewStringFromCString(Platform::OperatingSystem()));
+  Dart_SetReturnValue(args, DartUtils::NewString(Platform::OperatingSystem()));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(Platform_PathSeparator)(Dart_NativeArguments args) {
   Dart_EnterScope();
-  Dart_SetReturnValue(args, Dart_NewStringFromCString(File::PathSeparator()));
+  Dart_SetReturnValue(args, DartUtils::NewString(File::PathSeparator()));
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(Platform_LocalHostname)(Dart_NativeArguments args) {
   Dart_EnterScope();
   const intptr_t HOSTNAME_LENGTH = 256;
   char hostname[HOSTNAME_LENGTH];
   if (Platform::LocalHostname(hostname, HOSTNAME_LENGTH)) {
-    Dart_SetReturnValue(args, Dart_NewStringFromCString(hostname));
+    Dart_SetReturnValue(args, DartUtils::NewString(hostname));
   } else {
     Dart_SetReturnValue(args, DartUtils::NewDartOSError());
   }
   Dart_ExitScope();
 }
 
 
 void FUNCTION_NAME(Platform_Environment)(Dart_NativeArguments args) {
   Dart_EnterScope();
   intptr_t count = 0;
   char** env = Platform::Environment(&count);
   if (env == NULL) {
     OSError error(-1,
                   "Failed to retrieve environment variables.",
                   OSError::kUnknown);
     Dart_SetReturnValue(args, DartUtils::NewDartOSError(&error));
   } else {
     Dart_Handle result = Dart_NewList(count);
     if (Dart_IsError(result)) {
+      Platform::FreeEnvironment(env, count);
       Dart_PropagateError(result);
     }
     for (intptr_t i = 0; i < count; i++) {
-      Dart_Handle str = Dart_NewStringFromCString(env[i]);
+      Dart_Handle str = DartUtils::NewString(env[i]);
       if (Dart_IsError(str)) {
+        Platform::FreeEnvironment(env, count);
         Dart_PropagateError(str);
       }
       Dart_Handle error = Dart_ListSetAt(result, i, str);
       if (Dart_IsError(error)) {
+        Platform::FreeEnvironment(env, count);
         Dart_PropagateError(error);
       }
     }
-    delete[] env;
+    Platform::FreeEnvironment(env, count);
     Dart_SetReturnValue(args, result);
   }
   Dart_ExitScope();
 }