Decouple FileSystem and WebSQL callbacks from VoidCallback and it non-refcounted

Source/modules/filesystem/DirectoryEntry.h

Index: Source/modules/filesystem/DirectoryEntry.h
diff --git a/Source/modules/filesystem/DirectoryEntry.h b/Source/modules/filesystem/DirectoryEntry.h
index f7cbc479ebeeca3db51e41b6d83c7e36e9af0163..d1c097ab68a46c690075c5f09202dc1db5b07af3 100644
--- a/Source/modules/filesystem/DirectoryEntry.h
+++ b/Source/modules/filesystem/DirectoryEntry.h
@@ -43,7 +43,7 @@ class DOMFileSystemBase;
 class DirectoryReader;
 class EntryCallback;
 class ErrorCallback;
-class VoidCallback;
+class FileSystemVoidCallback;
 
 class DirectoryEntry : public Entry {
 public:
@@ -56,7 +56,7 @@ public:
     PassRefPtr<DirectoryReader> createReader();
     void getFile(const String& path, const Dictionary&, PassRefPtr<EntryCallback> = 0, PassRefPtr<ErrorCallback> = 0);
     void getDirectory(const String& path, const Dictionary&, PassRefPtr<EntryCallback> = 0, PassRefPtr<ErrorCallback> = 0);
-    void removeRecursively(PassRefPtr<VoidCallback> successCallback = 0, PassRefPtr<ErrorCallback> = 0) const;
+    void removeRecursively(PassRefPtr<FileSystemVoidCallback> successCallback = 0, PassRefPtr<ErrorCallback> = 0) const;
 
 private:
     DirectoryEntry(PassRefPtr<DOMFileSystemBase>, const String& fullPath);