Migrate towards allowlist in weblayer's grit list.

Bug: 1097260
Change-Id: I28a9eed52f254364c8782f6b6fe95f1e637cbbcc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2255559
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Auto-Submit: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780505}

weblayer/BUILD.gn

@@ -46,11 +46,11 @@ if (is_android) {
     # components_strings contains strings from all components. WebLayer
     # will never display most of them, so we try to limit the included
     # strings.
-    whitelist = rebase_path("grit_strings_whitelist.txt", root_build_dir)
-    inputs = [ "//weblayer/grit_strings_whitelist.txt" ]
+    allowlist = rebase_path("grit_strings_allowlist.txt", root_build_dir)
+    inputs = [ "//weblayer/grit_strings_allowlist.txt" ]
     grit_flags = [
       "-w",
-      whitelist,
+      allowlist,
     ]
     outputs =
         weblayer_components_strings_java_resources +
@@ -65,11 +65,11 @@ if (is_android) {
     # components_chromium_strings contains Chromium-specific strings. WebLayer
     # will never display most of them, so we try to limit the included
     # strings.
-    whitelist = rebase_path("grit_strings_whitelist.txt", root_build_dir)
-    inputs = [ "//weblayer/grit_strings_whitelist.txt" ]
+    allowlist = rebase_path("grit_strings_allowlist.txt", root_build_dir)
+    inputs = [ "//weblayer/grit_strings_allowlist.txt" ]
     grit_flags = [
       "-w",
-      whitelist,
+      allowlist,
     ]
     outputs = [ "grit/components_chromium_strings.h" ] +
               process_file_template(