Fix test failures introduced by r12342.

test/cctest/test-api.cc

Index: test/cctest/test-api.cc
diff --git a/test/cctest/test-api.cc b/test/cctest/test-api.cc
index 19a7d20b58ccc481737ec4660c35b66ffcb2342a..08c05bfc3a468d52139cf59c249a749715ea1097 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -14586,6 +14586,7 @@ TEST(Regress528) {
     context->Exit();
   }
   context.Dispose();
+  v8::V8::ContextDisposedNotification();
   for (gc_count = 1; gc_count < 10; gc_count++) {
     other_context->Enter();
     CompileRun(source_simple);
@@ -14608,6 +14609,7 @@ TEST(Regress528) {
     context->Exit();
   }
   context.Dispose();
+  v8::V8::ContextDisposedNotification();
   for (gc_count = 1; gc_count < 10; gc_count++) {
     other_context->Enter();
     CompileRun(source_eval);
@@ -14647,6 +14649,7 @@ TEST(Regress528) {
   CHECK_EQ(1, GetGlobalObjectsCount());
 
   other_context.Dispose();
+  v8::V8::ContextDisposedNotification();
 }