postmortem: fixup after 33994b4a

This commit has changed the enum names:

33994b4a

`FIELD` is now called `DATA`.

BUG=
R=danno

Review URL: https://codereview.chromium.org/1033733003

Cr-Commit-Position: refs/heads/master@{#27434}

tools/gen-postmortem-metadata.py

@@ -91,7 +91,7 @@ consts_misc = [
     { 'name': 'prop_idx_first',
         'value': 'DescriptorArray::kFirstIndex' },
     { 'name': 'prop_type_field',
-        'value': 'FIELD' },
+        'value': 'DATA' },
     { 'name': 'prop_type_mask',
         'value': 'PropertyDetails::TypeField::kMask' },
     { 'name': 'prop_index_mask',