Use feature architecture as kill switch for WebAPKs instead of field trial

chrome/browser/android/chrome_feature_list.cc

Index: chrome/browser/android/chrome_feature_list.cc
diff --git a/chrome/browser/android/chrome_feature_list.cc b/chrome/browser/android/chrome_feature_list.cc
index cb7531461ccc9f4b27f9ebb8e14d19ad2a51415c..dd9fff62ad7568a40ade0608d211cc4c6525909f 100644
--- a/chrome/browser/android/chrome_feature_list.cc
+++ b/chrome/browser/android/chrome_feature_list.cc
@@ -50,6 +50,7 @@ const base::Feature* kFeaturesExposedToJava[] = {
     &kSpecialLocaleFeature,
     &kSpecialLocaleWrapper,
     &kTabReparenting,
+    &kWebApks,
     &ntp_snippets::kContentSuggestionsFeature,
     &ntp_snippets::kSaveToOfflineFeature,
     &ntp_snippets::kSectionDismissalFeature,
@@ -107,6 +108,10 @@ const base::Feature kTabReparenting{"TabReparenting",
 const base::Feature kUserMediaScreenCapturing{
     "UserMediaScreenCapturing", base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Makes "Add to Home screen" in the app menu generate an APK for the shortcut
+// URL which opens Chrome in fullscreen.
+const base::Feature kWebApks{"WebApks", base::FEATURE_DISABLED_BY_DEFAULT};
+
 static jboolean IsEnabled(JNIEnv* env,
                           const JavaParamRef<jclass>& clazz,
                           const JavaParamRef<jstring>& jfeature_name) {