Shows the file handling flag on all desktop platforms.

Previously, the flag was only shown on ChromeOS, however there is
currently implementation work on Linux and Windows (and soon, on
MacOS), so it makes sense to show it on other platforms.

Bug: 829689
Change-Id: I91e0e37828bea9ebd3888d18def5ace42a475e97
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1833019
Commit-Queue: Jay Harris <[email protected]>
Commit-Queue: Giovanni Ortuño Urquidi <[email protected]>
Auto-Submit: Jay Harris <[email protected]>
Reviewed-by: Giovanni Ortuño Urquidi <[email protected]>
Cr-Commit-Position: refs/heads/master@{#701452}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 8a346b3..8b6b7eb 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -4031,7 +4031,7 @@
      FEATURE_VALUE_TYPE(blink::features::kNativeFileSystemAPI)},
 
     {"file-handling-api", flag_descriptions::kFileHandlingAPIName,
-     flag_descriptions::kFileHandlingAPIDescription, kOsCrOS,
+     flag_descriptions::kFileHandlingAPIDescription, kOsDesktop,
      FEATURE_VALUE_TYPE(blink::features::kFileHandlingAPI)},
 
 #if !defined(OS_ANDROID)