AndroidX Webkit: rename non-inclusive non-API references

No change to logic. This renames non-API references which use
non-inclusive terminology ("whitelist" -> "allowlist"). This
intentionally does not change APIs, as this will be changed in a future
CL.

Bug: 160929306
Bug: 160326030
Bug: 160249521
Test: ./gradlew :webkit:webkit:connectedAndroidTest
Test: manually verify the testapp
Change-Id: I0dfc4aed7045ecfc15f02a139a65bc85116c7f33

diff --git a/webkit/integration-tests/testapp/src/main/java/com/example/androidx/webkit/SafeBrowsingActivity.java b/webkit/integration-tests/testapp/src/main/java/com/example/androidx/webkit/SafeBrowsingActivity.java
index 73e1fa6..365f851 100644
--- a/webkit/integration-tests/testapp/src/main/java/com/example/androidx/webkit/SafeBrowsingActivity.java
+++ b/webkit/integration-tests/testapp/src/main/java/com/example/androidx/webkit/SafeBrowsingActivity.java

@@ -115,8 +115,8 @@
                         getResources().getString(R.string.custom_interstitial_activity_title),
                         new Intent(activityContext, CustomInterstitialActivity.class)),
                 new MenuListView.MenuItem(
-                        getResources().getString(R.string.whitelist_activity_title),
-                        new Intent(activityContext, WhitelistActivity.class)),
+                        getResources().getString(R.string.allowlist_activity_title),
+                        new Intent(activityContext, AllowlistActivity.class)),
         };
         listView.setItems(menuItems);
     }