Small: Serialize the store's hash_prefix_map_ to file in WriteToDisk()

components/safe_browsing_db/v4_store.h

Index: components/safe_browsing_db/v4_store.h
diff --git a/components/safe_browsing_db/v4_store.h b/components/safe_browsing_db/v4_store.h
index a2a89be440fbc1d185afb96838179dc31fdb80c6..3d7626257667963ab2d292d55cc75e8121678255 100644
--- a/components/safe_browsing_db/v4_store.h
+++ b/components/safe_browsing_db/v4_store.h
@@ -352,8 +352,11 @@ class V4Store {
       HashPrefixMap* additions_map);
 
   // Writes the FULL_UPDATE |response| to disk as a V4StoreFileFormat proto.

[Nathan Parker, 2016/10/11 20:29:42]

There's no longer a |response| arg

[vakh (use Gerrit instead), 2016/10/11 21:50:39]

Done.

-  StoreWriteResult WriteToDisk(
-      std::unique_ptr<ListUpdateResponse> response) const;
+  // |list_id| is used to set the (|platform_type|, |threat_entry_type|,
+  // threat_type|) fields, and |checksum| is used to set the |checksum| field in
+  // the final proto.
+  StoreWriteResult WriteToDisk(const ListIdentifier& list_id,
+                               const Checksum& checksum) const;
 
   // The checksum value as read from the disk, until it is verified. Once
   // verified, it is cleared.