style: Rename the PseudoId enum values to CamelCase and prefix them.

third_party/WebKit/Source/core/events/EventPathTest.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 "core/events/EventPath.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/Document.h"
 #include "core/dom/PseudoElement.h"
 #include "core/style/ComputedStyleConstants.h"
@@ skipping 13 matching lines @@
 };
 
 void EventPathTest::SetUp()
 {
     m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
 }
 
 TEST_F(EventPathTest, ShouldBeEmptyForPseudoElementWithoutParentElement)
 {
     RefPtrWillBeRawPtr<Element> div = document().createElement(HTMLNames::divTag, false);
-    RefPtrWillBeRawPtr<PseudoElement> pseudo = PseudoElement::create(div.get(), FIRST_LETTER);
+    RefPtrWillBeRawPtr<PseudoElement> pseudo = PseudoElement::create(div.get(), PseudoIdFirstLetter);
     pseudo->dispose();
     EventPath eventPath(*pseudo);
     EXPECT_TRUE(eventPath.isEmpty());
 }
 
 } // namespace blink