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

Source/core/dom/DocumentFragment.h

Index: Source/core/dom/DocumentFragment.h
diff --git a/Source/core/dom/DocumentFragment.h b/Source/core/dom/DocumentFragment.h
index f75e19b4d668e31a401a0c517bd08fb1f9c44cfa..27ffd82938cb48b551c78fb952ecf04e73e774b0 100644
--- a/Source/core/dom/DocumentFragment.h
+++ b/Source/core/dom/DocumentFragment.h
@@ -24,12 +24,13 @@
 #ifndef DocumentFragment_h
 #define DocumentFragment_h
 
+#include "core/CoreExport.h"
 #include "core/dom/ContainerNode.h"
 #include "core/dom/ParserContentPolicy.h"
 
 namespace blink {
 
-class DocumentFragment : public ContainerNode {
+class CORE_EXPORT DocumentFragment : public ContainerNode {
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<DocumentFragment> create(Document&);