Treat APKs as dangerous on Linux as well as on Android.

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 17d21388c9592728f99b81d95937de74592b1aec..29790bdbd2ee2720bdd1aba8c56f9857fe195806 100644
--- a/chrome/browser/resources/safe_browsing/download_file_types.asciipb
+++ b/chrome/browser/resources/safe_browsing/download_file_types.asciipb
@@ -8,7 +8,7 @@
 ##
 ## Top level settings
 ##
-version_id: 7
+version_id: 8
 sampled_ping_probability: 0.01
 default_file_type {
   uma_value: 18
@@ -2659,4 +2659,9 @@ file_types {
     danger_level: ALLOW_ON_USER_GESTURE
     auto_open_hint: DISALLOW_AUTO_OPEN
   }
+  platform_settings {
+    platform: PLATFORM_LINUX
+    danger_level: ALLOW_ON_USER_GESTURE
+    auto_open_hint: DISALLOW_AUTO_OPEN
+  }
 }