Remove checksum in CDM interface and implementations.

webkit/plugins/ppapi/ppapi_plugin_instance.cc

Index: webkit/plugins/ppapi/ppapi_plugin_instance.cc
diff --git a/webkit/plugins/ppapi/ppapi_plugin_instance.cc b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
index 600fc44f87dc78d3f9e5d2b59cf094c628aa2d2f..2f0d9a27cb50fe44512474d0516687c1e03fadc2 100644
--- a/webkit/plugins/ppapi/ppapi_plugin_instance.cc
+++ b/webkit/plugins/ppapi/ppapi_plugin_instance.cc
@@ -359,13 +359,11 @@ bool MakeEncryptedBlockInfo(
   block_info->data_offset = decrypt_config.data_offset();
 
   if (!CopyStringToArray(decrypt_config.key_id(), block_info->key_id) ||
-      !CopyStringToArray(decrypt_config.iv(), block_info->iv) ||
-      !CopyStringToArray(decrypt_config.checksum(), block_info->checksum))
+      !CopyStringToArray(decrypt_config.iv(), block_info->iv))
     return false;
 
   block_info->key_id_size = decrypt_config.key_id().size();
   block_info->iv_size = decrypt_config.iv().size();
-  block_info->checksum_size = decrypt_config.checksum().size();
 
   if (decrypt_config.subsamples().size() > arraysize(block_info->subsamples))
     return false;