Allow Object.defineProperty to update value of an API accessor.

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 e90dd4e2677d53e9abb2e471734f7d977b09c245..45042b61ad7143935553b1cbb1aafe59ed7a627a 100644
--- a/test/cctest/test-api.cc
+++ b/test/cctest/test-api.cc
@@ -9396,7 +9396,6 @@ TEST(AccessControlES5) {
   CHECK_EQ(42, g_echo_value_1);
 
   v8::Handle<Value> value;
-  // We follow Safari in ignoring assignments to host object accessors.
   CompileRun("Object.defineProperty(other, 'accessible_prop', {value: -1})");
   value = CompileRun("other.accessible_prop == 42");
   CHECK(value->IsTrue());