Remove a comment I should have removed in #690843

Also replace two assert()s with the newer and here more-appropriate
not_needed()

Bug: none
Change-Id: I48445701b0d15d648d3083fc0103def9a5b2aa68
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804319
Auto-Submit: Nico Weber <thakis@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696765}

build/config/locales.gni

@@ -37,12 +37,11 @@ ios_unsupported_locales = [
 ]
 
 # These list are defined even when not building for Android or iOS for the
-# sake of build/locale_tool.py. These asserts ensure that GN doesn't complain
-# about them being unused.
-assert(android_chrome_omitted_locales != [])
-assert(ios_unsupported_locales != [])
+# sake of build/locale_tool.py. Ensure that GN doesn't complain about them
+# being unused.
+not_needed([ "android_chrome_omitted_locales" ])
+not_needed([ "ios_unsupported_locales" ])
 
-# Note: keep in sync with below.
 locales = [
   "am",
   "ar",