Allow passing mock FrameLoaderClient to DummyPageHolder.

Source/core/html/HTMLFormControlElementTest.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/html/HTMLFormControlElement.h"
 
 #include "core/frame/FrameView.h"
 #include "core/html/HTMLDocument.h"
 #include "core/html/HTMLInputElement.h"
+#include "core/loader/EmptyClients.h"
 #include "core/testing/DummyPageHolder.h"
 #include <gtest/gtest.h>
 
 namespace blink {
 
 class HTMLFormControlElementTest : public ::testing::Test {
 protected:
     virtual void SetUp() OVERRIDE;
 
     DummyPageHolder& page() const { return *m_dummyPageHolder; }
@@ skipping 39 matching lines @@
     EXPECT_EQ(RTL, subMessageDir);
 
     input->setCustomValidity(String::fromUTF8("Main message."));
     message = input->validationMessage().stripWhiteSpace();
     input->findCustomValidationMessageTextDirection(message, messageDir, subMessage, subMessageDir);
     EXPECT_EQ(LTR, messageDir);
     EXPECT_EQ(RTL, subMessageDir);
 }
 
 }