Initialize ClassLinker from image

Change-Id: Ibaf47b4181f7c6603a8b37e2eba8fa6509c927ed
diff --git a/src/zip_archive.h b/src/zip_archive.h
index 8001fa3..26cb438 100644
--- a/src/zip_archive.h
+++ b/src/zip_archive.h
@@ -119,7 +119,7 @@
   uint16_t num_entries_;
   off_t dir_offset_;
   scoped_ptr<MemMap> dir_map_;
-  typedef std::tr1::unordered_map<StringPiece, const byte*> DirEntries;
+  typedef std::tr1::unordered_map<StringPiece, const byte*, StringPieceHash> DirEntries;
   DirEntries dir_entries_;
 
   friend class ZipEntry;