Fixed uncompressing files with wrong uncompressed size set.

third_party/zlib/google/zip_reader.h

Index: third_party/zlib/google/zip_reader.h
diff --git a/third_party/zlib/google/zip_reader.h b/third_party/zlib/google/zip_reader.h
index e16a2fb45c6916abaf90375ee0790ce2a4b379d3..60b53ee6e660ac3f7aee4e09b57ac9b950148e9d 100644
--- a/third_party/zlib/google/zip_reader.h
+++ b/third_party/zlib/google/zip_reader.h
@@ -64,6 +64,8 @@ class ZipReader {
 
     // Returns the size of the original file (i.e. after uncompressed).
     // Returns 0 if the entry is a directory.
+    // Note: this value should not be trusted, because it is stored as metadata
+    // in the zip archive and can be different from the real uncompressed size.
     int64 original_size() const { return original_size_; }
 
     // Returns the last modified time. If the time stored in the zip file was