Componentization: make core classes visible for blink_tests and blink_web.

Source/core/dom/PseudoElement.h

 /*
  * Copyright (C) 2012 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.
  *     * Neither the name of Google Inc. nor the names of its
  * contributors may be used to endorse or promote products derived from
  * this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 #ifndef PseudoElement_h
 #define PseudoElement_h
 
+#include "core/CoreExport.h"
 #include "core/dom/Element.h"
 #include "core/style/ComputedStyle.h"
 
 namespace blink {
 
-class PseudoElement : public Element {
+class CORE_EXPORT PseudoElement : public Element {
 public:
     static PassRefPtrWillBeRawPtr<PseudoElement> create(Element* parent, PseudoId);
 
     virtual PassRefPtr<ComputedStyle> customStyleForLayoutObject() override;
     virtual void attach(const AttachContext& = AttachContext()) override;
     virtual bool layoutObjectIsNeeded(const ComputedStyle&) override;
 
     virtual bool canStartSelection() const override { return false; }
     virtual bool canContainRangeEndPoint() const override { return false; }
     virtual PseudoId pseudoId() const override { return m_pseudoId; }
@@ skipping 24 matching lines @@
     if (style->styleType() == FIRST_LETTER || style->styleType() == BACKDROP)
         return true;
     return style->contentData();
 }
 
 DEFINE_ELEMENT_TYPE_CASTS(PseudoElement, isPseudoElement());
 
 } // namespace
 
 #endif