Replace term "whitelist" with "allowlist" in chrome/browser/prefs

Bug: 1097249
Change-Id: Ifc815f8f94d485906b31b87ae06d39b0eea7eb81
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537060Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827894}

chrome/browser/prefs/pref_service_incognito_allowlist.cc

@@ -166,10 +166,10 @@ const char* const kPersistentPrefNames[] = {
 namespace prefs {
 
 std::vector<const char*> GetIncognitoPersistentPrefsAllowlist() {
-  std::vector<const char*> whitelist;
-  whitelist.insert(whitelist.end(), kPersistentPrefNames,
+  std::vector<const char*> allowlist;
+  allowlist.insert(allowlist.end(), kPersistentPrefNames,
                    kPersistentPrefNames + base::size(kPersistentPrefNames));
-  return whitelist;
+  return allowlist;
 }
 
 }  // namespace prefs