Remove old isolate API and update all code in the repository to use

runtime/vm/dart_api_impl_test.cc

Index: runtime/vm/dart_api_impl_test.cc
diff --git a/runtime/vm/dart_api_impl_test.cc b/runtime/vm/dart_api_impl_test.cc
index 6bd4ae0e681528bb3b08684118538d5f3afd7672..0cd8473f366861a3f594f7c1996b3af7e4002d07 100644
--- a/runtime/vm/dart_api_impl_test.cc
+++ b/runtime/vm/dart_api_impl_test.cc
@@ -5936,26 +5936,22 @@ static bool RunLoopTestCallback(const char* script_name,
   const char* kScriptChars =
       "#import('builtin');\n"
       "#import('dart:isolate');\n"
-      "class MyIsolate extends Isolate {\n"
-      "  MyIsolate() : super() { }\n"
-      "  void main() {\n"
-      "    port.receive((message, replyTo) {\n"
-      "      if (message) {\n"
-      "        throw new Exception('MakeChildExit');\n"
-      "      } else {\n"
-      "        replyTo.call('hello');\n"
-      "        port.close();\n"
-      "      }\n"
-      "    });\n"
-      "  }\n"
+      "void entry() {\n"
+      "  port.receive((message, replyTo) {\n"
+      "    if (message) {\n"
+      "      throw new Exception('MakeChildExit');\n"
+      "    } else {\n"
+      "      replyTo.call('hello');\n"
+      "      port.close();\n"
+      "    }\n"
+      "  });\n"
       "}\n"
       "\n"
       "void main(exc_child, exc_parent) {\n"
-      "  new MyIsolate().spawn().then((port) {\n"
-      "    port.call(exc_child).then((message) {\n"
-      "      if (message != 'hello') throw new Exception('ShouldNotHappen');\n"
-      "      if (exc_parent) throw new Exception('MakeParentExit');\n"
-      "    });\n"
+      "  var port = spawnFunction(entry);\n"
+      "  port.call(exc_child).then((message) {\n"
+      "    if (message != 'hello') throw new Exception('ShouldNotHappen');\n"
+      "    if (exc_parent) throw new Exception('MakeParentExit');\n"
       "  });\n"
       "}\n";