[test] Test expectations in cctest should use CHECK and not DCHECK.

test/cctest/test-inobject-slack-tracking.cc

Index: test/cctest/test-inobject-slack-tracking.cc
diff --git a/test/cctest/test-inobject-slack-tracking.cc b/test/cctest/test-inobject-slack-tracking.cc
index 79cb8335adbf6e1836541c8da3cc12c4ca506b6e..5fdebb124ed9249d97fab6617a95006025cb22e1 100644
--- a/test/cctest/test-inobject-slack-tracking.cc
+++ b/test/cctest/test-inobject-slack-tracking.cc
@@ -99,7 +99,7 @@ static double GetDoubleFieldValue(JSObject* obj, FieldIndex field_index) {
     return obj->RawFastDoublePropertyAt(field_index);
   } else {
     Object* value = obj->RawFastPropertyAt(field_index);
-    DCHECK(value->IsMutableHeapNumber());
+    CHECK(value->IsMutableHeapNumber());
     return HeapNumber::cast(value)->value();
   }
 }
@@ -578,7 +578,7 @@ static void TestClassHierarchy(const std::vector<int>& hierarchy_desc, int n) {
     fields_count += fields_count_at_current_level;
 
     // This test is not suitable for in-object properties count overflow case.
-    DCHECK_LT(fields_count, kMaxInobjectProperties);
+    CHECK_LT(fields_count, kMaxInobjectProperties);
 
     // Create |class_name| objects and check slack tracking.
     v8::Local<v8::Script> new_script = GetNewObjectScript(class_name);