Componentization: make core/dom visible for blink_web and blink_tests.

Source/core/dom/RemoteSecurityContext.h

 // 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.
 
 #ifndef RemoteSecurityContext_h
 #define RemoteSecurityContext_h
 
+#include "core/CoreExport.h"
 #include "core/dom/SecurityContext.h"
 
 namespace blink {
 
-class RemoteSecurityContext : public SecurityContext, public RefCounted<RemoteSecurityContext> {
+class CORE_EXPORT RemoteSecurityContext : public SecurityContext, public RefCounted<RemoteSecurityContext> {
 public:
     static PassRefPtr<RemoteSecurityContext> create();
     void setReplicatedOrigin(PassRefPtr<SecurityOrigin>);
 
     // FIXME: implement
     void didUpdateSecurityOrigin() override { }
 
 private:
     RemoteSecurityContext();
 };
 
 } // namespace blink
 
 #endif // RemoteSecurityContext_h