Fixed WebDragData's wrong dependency.

public/platform/WebDragData.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 73 matching lines @@
         WebURL baseURL;
     };
 
     WebDragData() { }
     WebDragData(const WebDragData& object) { assign(object); }
     WebDragData& operator=(const WebDragData& object)
     {
         assign(object);
         return *this;
     }
-    ~WebDragData() { reset(); }
+    ~WebDragData()
+    {
+#if BLINK_IMPLEMENTATION
+        m_private.reset();
+#else
+        reset();
+#endif
+    }
 
     bool isNull() const { return m_private.isNull(); }
 
     BLINK_EXPORT void initialize();
     BLINK_EXPORT void reset();
     BLINK_EXPORT void assign(const WebDragData&);
 
     BLINK_EXPORT WebVector<Item> items() const;
     BLINK_EXPORT void setItems(const WebVector<Item>&);
     BLINK_EXPORT void addItem(const Item&);
 
     BLINK_EXPORT WebString filesystemId() const;
     BLINK_EXPORT void setFilesystemId(const WebString&);
 
 #if BLINK_IMPLEMENTATION
-    explicit WebDragData(const PassRefPtrWillBeRawPtr<DataObject>&);
-    WebDragData& operator=(const PassRefPtrWillBeRawPtr<DataObject>&);
-    DataObject* getValue() const;
+    // FIXME: to avoid "core depends on web", use inline here.

[tkent, 2015/02/18 02:17:57]

The problem is "platform depends on core", not "core depends on web".
We should do:

- Remove DataObject dependency from WebDragData.
  Now WebDragData is a wrapper of DataObject.  We should change it so that
WebDragData contains real data.

- Move WebDragData.cpp from Source/web/ to Source/platform/exported/.

[tasak, 2015/02/23 09:20:33]

Done.

+    // After merging blink repository with content repository, redesign
+    // how core works with web and content.
+    explicit WebDragData(const PassRefPtrWillBeRawPtr<DataObject>& object)
+    {
+        m_private = object;
+    }
+    WebDragData& operator=(const PassRefPtrWillBeRawPtr<DataObject>& object)
+    {
+        m_private = object;
+        return *this;
+    }
+    DataObject* getValue() const
+    {
+        return m_private.get();
+    }
 #endif
 
 private:
     void ensureMutable();
     WebPrivatePtr<DataObject> m_private;
 };
 
 } // namespace blink
 
 #endif