Encapsulate optional SerializedScriptValue serialize/deserialize parameters.

third_party/WebKit/Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 988 matching lines @@
 namespace {
 
 RefPtr<SerializedScriptValue> serializeString(const StringView& message,
                                               ScriptState* scriptState) {
   // This is inefficient, but avoids duplicating serialization logic for the
   // sake of this test.
   NonThrowableExceptionState exceptionState;
   ScriptState::Scope scope(scriptState);
   V8ScriptValueSerializer serializer(scriptState);
   return serializer.serialize(v8String(scriptState->isolate(), message),
-                              nullptr, exceptionState);
+                              exceptionState);
 }
 
 }  // namespace
 
 TEST_P(ParameterizedWebFrameTest, PostMessageThenDetach) {
   FrameTestHelpers::WebViewHelper webViewHelper;
   webViewHelper.initializeAndLoad("about:blank");
 
   LocalFrame* frame =
       toLocalFrame(webViewHelper.webView()->page()->mainFrame());
@@ skipping 10489 matching lines @@
   EXPECT_FALSE(testSelectAll("<textarea></textarea>"));
   EXPECT_TRUE(testSelectAll("<textarea>nonempty</textarea>"));
   EXPECT_FALSE(testSelectAll("<input>"));
   EXPECT_TRUE(testSelectAll("<input value='nonempty'>"));
   // TODO(amaralp): Empty contenteditable should not have select all enabled.
   EXPECT_TRUE(testSelectAll("<div contenteditable></div>"));
   EXPECT_TRUE(testSelectAll("<div contenteditable>nonempty</div>"));
 }
 
 }  // namespace blink