enter_chroot: drop .disable_build_stats_upload

This is from code we dropped years ago.

BUG=chromium:698105
TEST=CQ passes

Change-Id: Ic094d7099bc09d0107ae760742d3d62e6ab0c3b8
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/1960559
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: Mike Nichols <mikenichols@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/sdk_lib/enter_chroot.sh b/sdk_lib/enter_chroot.sh
index 39a3ff6..4c7bcc2 100755
--- a/sdk_lib/enter_chroot.sh
+++ b/sdk_lib/enter_chroot.sh
@@ -81,7 +81,6 @@
 FILES_TO_COPY_TO_CHROOT=(
   .gdata_cred.txt             # User/password for Google Docs on chromium.org
   .gdata_token                # Auth token for Google Docs on chromium.org
-  .disable_build_stats_upload # Presence of file disables command stats upload
   .inputrc                    # Preserve command line customizations
 )