Various ApiCheck-related cleanups.

src/handles.cc

Index: src/handles.cc
diff --git a/src/handles.cc b/src/handles.cc
index bc8d2d759d4a8b15ae8c76b0c27dc127b875ae04..b3282faffecbe3da69eff779c0f45b6b6e112ab6 100644
--- a/src/handles.cc
+++ b/src/handles.cc
@@ -63,9 +63,9 @@ Object** HandleScope::Extend(Isolate* isolate) {
   ASSERT(result == current->limit);
   // Make sure there's at least one scope on the stack and that the
   // top of the scope stack isn't a barrier.
-  if (current->level == 0) {
-    Utils::ReportApiFailure("v8::HandleScope::CreateHandle()",
-                            "Cannot create a handle without a HandleScope");
+  if (!Utils::ApiCheck(current->level != 0,
+                       "v8::HandleScope::CreateHandle()",
+                       "Cannot create a handle without a HandleScope")) {
     return NULL;
   }
   HandleScopeImplementer* impl = isolate->handle_scope_implementer();