Refactor CRX verification in preparation to support CRX₃ files.

extensions/browser/sandboxed_unpacker.h

Index: extensions/browser/sandboxed_unpacker.h
diff --git a/extensions/browser/sandboxed_unpacker.h b/extensions/browser/sandboxed_unpacker.h
index 5b081df194529f223418b11ef554625d78d37477..48e5acbe0fba4f5196374fa7cca556a01a167576 100644
--- a/extensions/browser/sandboxed_unpacker.h
+++ b/extensions/browser/sandboxed_unpacker.h
@@ -5,6 +5,7 @@
 #ifndef EXTENSIONS_BROWSER_SANDBOXED_UNPACKER_H_
 #define EXTENSIONS_BROWSER_SANDBOXED_UNPACKER_H_
 
+#include <memory>
 #include <string>
 
 #include "base/files/file_path.h"
@@ -137,15 +138,10 @@ class SandboxedUnpacker : public base::RefCountedThreadSafe<SandboxedUnpacker> {
     // SandboxedUnpacker::ValidateSignature()
     CRX_FILE_NOT_READABLE,
     CRX_HEADER_INVALID,
-    CRX_MAGIC_NUMBER_INVALID,
-    CRX_VERSION_NUMBER_INVALID,
-    CRX_EXCESSIVELY_LARGE_KEY_OR_SIGNATURE,
-    CRX_ZERO_KEY_LENGTH,
-    CRX_ZERO_SIGNATURE_LENGTH,
-    CRX_PUBLIC_KEY_INVALID,
-    CRX_SIGNATURE_INVALID,
+    CRX_FILE_IS_DELTA_UPDATE,
     CRX_SIGNATURE_VERIFICATION_INITIALIZATION_FAILED,
     CRX_SIGNATURE_VERIFICATION_FAILED,
+    CRX_EXPECTED_HASH_INVALID,
 
     // SandboxedUnpacker::RewriteManifestFile()
     ERROR_SERIALIZING_MANIFEST_JSON,