Fixes some memory leaks in //runtime/bin

runtime/bin/dartutils.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/dartutils.h"
 
 #include "include/dart_api.h"
 #include "include/dart_tools_api.h"
 #include "include/dart_native_api.h"
 
@@ skipping 612 matching lines @@
   ASSERT(suffix != NULL);
   Dart_Handle res = Dart_NewStringFromCString(suffix);
   if (Dart_IsError(res)) {
     Dart_PropagateError(res);
   }
   Dart_SetReturnValue(args, res);
 }
 
 
 void FUNCTION_NAME(Builtin_GetCurrentDirectory)(Dart_NativeArguments args) {
-  char* current = Directory::Current();
+  const char* current = Directory::Current();
   if (current != NULL) {
     Dart_SetReturnValue(args, DartUtils::NewString(current));
-    free(current);
   } else {
     Dart_Handle err = DartUtils::NewError("Failed to get current directory.");
     Dart_PropagateError(err);
   }
 }
 
 
 Dart_Handle DartUtils::PrepareBuiltinLibrary(Dart_Handle builtin_lib,
                                              Dart_Handle internal_lib,
                                              bool is_service_isolate,
@@ skipping 298 matching lines @@
   return Dart_NewApiError(buffer);
 }
 
 
 Dart_Handle DartUtils::NewInternalError(const char* message) {
   return NewDartExceptionWithMessage(kCoreLibURL, "_InternalError", message);
 }
 
 
 bool DartUtils::SetOriginalWorkingDirectory() {
-  original_working_directory = Directory::Current();
+  original_working_directory = Directory::CurrentNoScope();
   return original_working_directory != NULL;
 }
 
 
 // Statically allocated Dart_CObject instances for immutable
 // objects. As these will be used by different threads the use of
 // these depends on the fact that the marking internally in the
 // Dart_CObject structure is not marking simple value objects.
 Dart_CObject CObject::api_null_ = { Dart_CObject_kNull , { 0 } };
 Dart_CObject CObject::api_true_ = { Dart_CObject_kBool , { true } };
@@ skipping 295 matching lines @@
       new CObjectString(CObject::NewString(os_error->message()));
   CObjectArray* result = new CObjectArray(CObject::NewArray(3));
   result->SetAt(0, new CObjectInt32(CObject::NewInt32(kOSError)));
   result->SetAt(1, new CObjectInt32(CObject::NewInt32(os_error->code())));
   result->SetAt(2, error_message);
   return result;
 }
 
 }  // namespace bin
 }  // namespace dart