Revert "Hide Isolate pointer from embedder"

runtime/bin/main.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 <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 
 #include "include/dart_api.h"
 #include "include/dart_debugger_api.h"
@@ skipping 573 matching lines @@
   ASSERT(script_uri != NULL);
   IsolateData* isolate_data = new IsolateData(script_uri, package_root);
   Dart_Isolate isolate = NULL;
 
   isolate = Dart_CreateIsolate(script_uri,
                                main,
                                isolate_snapshot_buffer,
                                isolate_data,
                                error);
 
-  if (isolate == DART_ILLEGAL_ISOLATE) {
-    return DART_ILLEGAL_ISOLATE;
+  if (isolate == NULL) {
+    return NULL;
   }
 
   Dart_EnterScope();
 
   if (isolate_snapshot_buffer != NULL) {
     // Setup the native resolver as the snapshot does not carry it.
     Builtin::SetNativeResolver(Builtin::kBuiltinLibrary);
     Builtin::SetNativeResolver(Builtin::kIOLibrary);
   }
 
@@ skipping 351 matching lines @@
   // Call CreateIsolateAndSetup which creates an isolate and loads up
   // the specified application script.
   char* error = NULL;
   int exit_code = 0;
   char* isolate_name = BuildIsolateName(script_name, "main");
   Dart_Isolate isolate = CreateIsolateAndSetupHelper(script_name,
                                                      "main",
                                                      commandline_package_root,
                                                      &error,
                                                      &exit_code);
-  if (isolate == DART_ILLEGAL_ISOLATE) {
+  if (isolate == NULL) {
     Log::PrintErr("%s\n", error);
     free(error);
     delete [] isolate_name;
     exit((exit_code != 0) ? exit_code : kErrorExitCode);
   }
   delete [] isolate_name;
 
   Dart_EnterIsolate(isolate);
   ASSERT(isolate == Dart_CurrentIsolate());
-  ASSERT(isolate != DART_ILLEGAL_ISOLATE);
+  ASSERT(isolate != NULL);
   Dart_Handle result;
 
   Dart_EnterScope();
 
   if (generate_script_snapshot) {
     // First create a snapshot.
     Dart_Handle result;
     uint8_t* buffer = NULL;
     intptr_t size = 0;
     result = Dart_CreateScriptSnapshot(&buffer, &size);
@@ skipping 101 matching lines @@
   exit(Process::GlobalExitCode());
 }
 
 }  // namespace bin
 }  // namespace dart
 
 int main(int argc, char** argv) {
   dart::bin::main(argc, argv);
   UNREACHABLE();
 }