Refactor the dart api a bit:

runtime/vm/exceptions_test.cc

 // Copyright (c) 2011, 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 "include/dart_api.h"
 
 #include "vm/assert.h"
 #include "vm/dart_api_impl.h"
 #include "vm/unit_test.h"
 
@@ skipping 12 matching lines @@
   if (!expected.Equals(actual)) {
     OS::Print("expected: '%s' actual: '%s'\n",
         expected.ToCString(), actual.ToCString());
     FATAL("Unhandled_equals fails.\n");
   }
 }
 
 
 void FUNCTION_NAME(Unhandled_invoke)(Dart_NativeArguments args) {
   // Invoke the specified entry point.
-  Dart_Result result = Dart_InvokeStatic(TestCase::lib(),
+  Dart_Handle result = Dart_InvokeStatic(TestCase::lib(),
                                          Dart_NewString("Second"),
                                          Dart_NewString("method2"),
                                          0,
                                          NULL);
-  ASSERT(Dart_IsValidResult(result));
-  ASSERT(Dart_ExceptionOccurred(Dart_GetResult(result)));
+  ASSERT(Dart_IsValid(result));
+  ASSERT(Dart_ExceptionOccurred(result));
   return;
 }
 
 
 void FUNCTION_NAME(Unhandled_invoke2)(Dart_NativeArguments args) {
   // Invoke the specified entry point.
-  Dart_Result result = Dart_InvokeStatic(TestCase::lib(),
+  Dart_Handle result = Dart_InvokeStatic(TestCase::lib(),
                                          Dart_NewString("Second"),
                                          Dart_NewString("method2"),
                                          0,
                                          NULL);
-  ASSERT(Dart_IsValidResult(result));
-  Dart_Handle retobj = Dart_GetResult(result);
-  ASSERT(Dart_ExceptionOccurred(retobj));
-  result = Dart_GetException(retobj);
-  ASSERT(Dart_IsValidResult(result));
-  Dart_Handle exception = Dart_GetResult(result);
+  ASSERT(Dart_IsValid(result));
+  ASSERT(Dart_ExceptionOccurred(result));
+  Dart_Handle exception = Dart_GetException(result);
+  ASSERT(Dart_IsValid(exception));
   Dart_ThrowException(exception);
   UNREACHABLE();
   return;
 }
 
 
 // List all native functions implemented in the vm or core boot strap dart
 // libraries so that we can resolve the native function to it's entry
 // point.
 #define UNHANDLED_NATIVE_LIST(V)                                               \
@@ skipping 65 matching lines @@
       reinterpret_cast<Dart_NativeEntryResolver>(native_lookup));
   Dart_InvokeStatic(lib,
                     Dart_NewString("UnhandledExceptionTest"),
                     Dart_NewString("testMain"),
                     0,
                     NULL);
 }
 #endif  // TARGET_ARCH_IA32.
 
 }  // namespace dart