Extract webkit_unit_tests from blink_web component.

third_party/WebKit/public/web/WebDocument.h

 /*
  * Copyright (C) 2009 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 124 matching lines @@
 
     BLINK_EXPORT WebVector<WebDraggableRegion> draggableRegions() const;
 
     BLINK_EXPORT v8::Local<v8::Value> registerEmbedderCustomElement(const WebString& name, v8::Local<v8::Value> options, WebExceptionCode&);
 
     BLINK_EXPORT WebURL manifestURL() const;
     BLINK_EXPORT bool manifestUseCredentials() const;
     BLINK_EXPORT WebDistillabilityFeatures distillabilityFeatures();
 
 #if BLINK_IMPLEMENTATION
-    WebDocument(const PassRefPtrWillBeRawPtr<Document>&);
-    WebDocument& operator=(const PassRefPtrWillBeRawPtr<Document>&);
-    operator PassRefPtrWillBeRawPtr<Document>() const;
+    BLINK_EXPORT WebDocument(const PassRefPtrWillBeRawPtr<Document>&);
+    BLINK_EXPORT WebDocument& operator=(const PassRefPtrWillBeRawPtr<Document>&);
+    BLINK_EXPORT operator PassRefPtrWillBeRawPtr<Document>() const;
 #endif
 };
 
 DECLARE_WEB_NODE_TYPE_CASTS(WebDocument);
 
 } // namespace blink
 
 #endif