FileTypePolicies class to load types from proto.

chrome/browser/resources/safe_browsing/download_file_types.asciipb

Index: chrome/browser/resources/safe_browsing/download_file_types.asciipb
diff --git a/chrome/browser/resources/safe_browsing/download_file_types.asciipb b/chrome/browser/resources/safe_browsing/download_file_types.asciipb
index b7f8d700bfed63c337ec23bbab1cd9d255b03856..5129ef7cbd97abdfe39094811c761f29c5b51e03 100644
--- a/chrome/browser/resources/safe_browsing/download_file_types.asciipb
+++ b/chrome/browser/resources/safe_browsing/download_file_types.asciipb
@@ -10,7 +10,7 @@
 version_id: 1
 sampled_ping_probability: 0.0
 default_file_type {
-  uma_value: 19
+  uma_value: 18
   platform_settings {
     danger_level: ALLOW_ON_USER_GESTURE
     auto_open_hint: DISALLOW_AUTO_OPEN
@@ -22,7 +22,7 @@ default_file_type {
 #
 file_types {
   extension: "exe"
-  uma_value: 777
+  uma_value: 0
   platform_settings {
     danger_level: ALLOW_ON_USER_GESTURE
     auto_open_hint: DISALLOW_AUTO_OPEN
@@ -31,7 +31,7 @@ file_types {
 }
 file_types {
   extension: "zip"
-  uma_value: 888
+  uma_value: 7
   is_archive: true
   platform_settings {
     danger_level: NOT_DANGEROUS