VM: Refactor allocation stats code and remove duplicate code.

runtime/vm/dart_api_impl_test.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/builtin.h"
 #include "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 #include "include/dart_tools_api.h"
 #include "platform/assert.h"
@@ skipping 2476 matching lines @@
 
 
 // Helper class to ensure new gen GC is triggered without any side effects.
 // The normal call to CollectGarbage(Heap::kNew) could potentially trigger
 // an old gen collection if there is a promotion failure and this could
 // perturb the test.
 class GCTestHelper : public AllStatic {
  public:
   static void CollectNewSpace(Heap::ApiCallbacks api_callbacks) {
     bool invoke_api_callbacks = (api_callbacks == Heap::kInvokeApiCallbacks);
-    Isolate::Current()->heap()->new_space_->Scavenge(invoke_api_callbacks);
+    Isolate::Current()->heap()->new_space()->Scavenge(invoke_api_callbacks);
   }
 };
 
 
 static Dart_Handle AsHandle(Dart_PersistentHandle weak) {
   return Dart_HandleFromPersistent(weak);
 }
 
 
 static Dart_Handle AsHandle(Dart_WeakPersistentHandle weak) {
@@ skipping 6764 matching lines @@
   Dart_TimelineAsyncEnd("testAsyncEvent", async_id);
 
   // Check that it is in the output.
   TimelineEventRecorder* recorder = isolate->timeline_event_recorder();
   JSONStream js;
   recorder->PrintJSON(&js);
   EXPECT_SUBSTRING("testAsyncEvent", js.ToCString());
 }
 
 }  // namespace dart