Declare missing fields of DropData in IPC_STRUCT_TRAITS

content/common/drag_traits.h

Index: content/common/drag_traits.h
diff --git a/content/common/drag_traits.h b/content/common/drag_traits.h
index 16ea9b1e8fa73a351ce71a49837669d5f00037c8..e307a82bcb65d28fecb5c3ae5158deb824e9507d 100644
--- a/content/common/drag_traits.h
+++ b/content/common/drag_traits.h
@@ -24,11 +24,13 @@ IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::DropData)
   IPC_STRUCT_TRAITS_MEMBER(key_modifiers)
+  IPC_STRUCT_TRAITS_MEMBER(did_originate_from_renderer)

[dcheng, 2017/06/15 19:33:52]

I'm not sure if we should plumb this one through. It's used only on the browser
side for checks, and we wouldn't want to trust this bit when it comes from the
renderer anyway.

   IPC_STRUCT_TRAITS_MEMBER(url)
   IPC_STRUCT_TRAITS_MEMBER(url_title)
   IPC_STRUCT_TRAITS_MEMBER(download_metadata)
   IPC_STRUCT_TRAITS_MEMBER(referrer_policy)
   IPC_STRUCT_TRAITS_MEMBER(filenames)
+  IPC_STRUCT_TRAITS_MEMBER(file_mime_types)

[dcheng, 2017/06/15 19:33:52]

Similarly it doesn't seem like this is actually used except for generating
DropData::Metadata. So maybe it doesn't belong in drop data?

   IPC_STRUCT_TRAITS_MEMBER(filesystem_id)
   IPC_STRUCT_TRAITS_MEMBER(file_system_files)
   IPC_STRUCT_TRAITS_MEMBER(text)