[FilesTrash] Enable trash by default

We're aiming to land in M108. Let's enable the flag by default to ensure
adequate time between now and branch.

Bug: b:249397839
Test: browser_tests, unit_tests, FileManagerJsTest
Test: CQ
Change-Id: I6e62ed3dfcf0bf6babde9e7a90cee3060234a60f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3924656
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Ben Reich <benreich@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1052210}

ash/constants/ash_features.cc

@@ -906,7 +906,7 @@ BASE_FEATURE(kFilesSinglePartitionFormat,
              base::FEATURE_DISABLED_BY_DEFAULT);
 
 // Enable files app trash.
-BASE_FEATURE(kFilesTrash, "FilesTrash", base::FEATURE_DISABLED_BY_DEFAULT);
+BASE_FEATURE(kFilesTrash, "FilesTrash", base::FEATURE_ENABLED_BY_DEFAULT);
 
 // Enables filters in Files app Recents view V2.
 BASE_FEATURE(kFiltersInRecentsV2,