Move FormDataList::deleteEntry() and hasEntry() to DOMFormData.

Source/core/html/DOMFormDataTest.cpp

 // Copyright 2015 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/DOMFormData.h"
 
 #include "core/html/FormDataList.h"
 #include <gtest/gtest.h>
 
@@ skipping 45 matching lines @@
     // Internal interface should be uneffected.
     EXPECT_EQ(1u, fd->size());
 }
 
 TEST(DOMFormDataTest, opacityHas)
 {
     DOMFormData* fd = DOMFormData::create(UTF8Encoding());
     fd->append("name1", "value1");
 
     EXPECT_TRUE(fd->has("name1"));
-    EXPECT_TRUE(fd->hasEntry("name1"));
+    EXPECT_EQ(1u, fd->size());
 
     fd->makeOpaque();
 
     // Web-exposed interface should be opaque.
     EXPECT_FALSE(fd->has("name1"));
 
-    // Internal interface should be uneffected.
-    EXPECT_TRUE(fd->hasEntry("name1"));
+    // Internal collection should be uneffected.
+    EXPECT_EQ(1u, fd->size());
 }
 
 } // namespace blink