UnpackingDirectory: Remove unnessary methods

Remove Read() and ReadSymlink() methods which are already implemented in
Directory.

src/add-ons/kernel/file_systems/packagefs/UnpackingDirectory.cpp

@@ -139,27 +139,6 @@ UnpackingDirectory::GetPackageNode()
 }
 
 
-status_t
-UnpackingDirectory::Read(off_t offset, void* buffer, size_t* bufferSize)
-{
-	return B_IS_A_DIRECTORY;
-}
-
-
-status_t
-UnpackingDirectory::Read(io_request* request)
-{
-	return B_IS_A_DIRECTORY;
-}
-
-
-status_t
-UnpackingDirectory::ReadSymlink(void* buffer, size_t* bufferSize)
-{
-	return B_IS_A_DIRECTORY;
-}
-
-
 status_t
 UnpackingDirectory::OpenAttributeDirectory(AttributeDirectoryCookie*& _cookie)
 {

src/add-ons/kernel/file_systems/packagefs/UnpackingDirectory.h

@@ -31,13 +31,6 @@ public:
 
 	virtual	PackageNode*		GetPackageNode();
 
-	virtual	status_t			Read(off_t offset, void* buffer,
-									size_t* bufferSize);
-	virtual	status_t			Read(io_request* request);
-
-	virtual	status_t			ReadSymlink(void* buffer,
-									size_t* bufferSize);
-
 	virtual	status_t			OpenAttributeDirectory(
 									AttributeDirectoryCookie*& _cookie);
 	virtual	status_t			OpenAttribute(const char* name, int openMode,