Populate download_file_types proto and filter it for each platform

chrome/common/safe_browsing/download_protection_util.cc

Index: chrome/common/safe_browsing/download_protection_util.cc
diff --git a/chrome/common/safe_browsing/download_protection_util.cc b/chrome/common/safe_browsing/download_protection_util.cc
index 381ae51dd8d8414d643fece2889cc9f8990b908f..32a9c08230b425f4bc3c0c56a7724260cf84aaf2 100644
--- a/chrome/common/safe_browsing/download_protection_util.cc
+++ b/chrome/common/safe_browsing/download_protection_util.cc
@@ -282,6 +282,9 @@ enum SBClientDownloadExtensions {
   EXTENSION_NDIF,
   EXTENSION_UDIF,
   EXTENSION_TOAST,
+  // NOTE!  If you modify this list, you should also update

[Lei Zhang, 2016/05/09 23:28:01]

Is is possible to enforce this with static_assert?

[Nathan Parker, 2016/05/10 17:33:51]

Done. I'm not actually comparing this list to the protobuf list, since the
latter already does contain more (a few were missing from here).

This list should go away in the next week or so.

+  // chrome/browser/resources/safe_browsing/download_file_types.asciipb
+
   // New values go above this one.
   EXTENSION_MAX
 };