Add download_file_types.proto with ascii->binary conversion, as a resource.

chrome/chrome_common.gypi

Index: chrome/chrome_common.gypi
diff --git a/chrome/chrome_common.gypi b/chrome/chrome_common.gypi
index 9ded65f0126314e0d4b2652e3b641bcb5b736b3f..85d7ad04d7931b95ce9a8250bc7e7fa8e68285d6 100644
--- a/chrome/chrome_common.gypi
+++ b/chrome/chrome_common.gypi
@@ -622,8 +622,8 @@
     },
     {
       # Protobuf compiler / generator for the safebrowsing client
-      # model proto and the client-side detection (csd) request
-      # protocol buffer.
+      # model proto, the client-side detection (csd) request
+      # proto, and the download file types proto.
 
       # GN version: //chrome/common/safe_browsing:proto
       'target_name': 'safe_browsing_proto',
@@ -631,7 +631,8 @@
       'sources': [
         'common/safe_browsing/client_model.proto',
         'common/safe_browsing/crx_info.proto',
-        'common/safe_browsing/csd.proto'
+        'common/safe_browsing/csd.proto',
+        'common/safe_browsing/download_file_types.proto',
       ],
       'variables': {
         'proto_in_dir': 'common/safe_browsing',