Make chrome://flags control whether the WebAPK feature is on

chrome/android/java/src/org/chromium/chrome/browser/preferences/ChromePreferenceManager.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.preferences;
 
 import android.content.Context;
 import android.content.SharedPreferences;
 
 import org.chromium.base.ContextUtils;
@@ skipping 338 matching lines @@
     /** Checks the cached value for the app link feature. */
     public boolean getCachedInstantAppsEnabled() {
         return mSharedPreferences.getBoolean(INSTANT_APPS_KEY, false);
     }
 
     /** Writes the cached value for whether app link is enabled. */
     public void setCachedInstantAppsEnabled(boolean isEnabled) {
         writeBoolean(INSTANT_APPS_KEY, isEnabled);
     }
 
-    /** Checks the cached value for the WebAPK command line flag. */
-    public boolean getCachedWebApkCommandLineEnabled() {
-        return mSharedPreferences.getBoolean(WEBAPK_COMMAND_LINE_KEY, false);
-    }
-
-    /** Sets the cached value for the WebAPK command line flag. */
-    public void setCachedWebApkCommandLineEnabled(boolean isEnabled) {
-        writeBoolean(WEBAPK_COMMAND_LINE_KEY, isEnabled);
-    }
-
     /** Checks the cached value for the webapk feature. */
     public boolean getCachedWebApkRuntimeEnabled() {
         return mSharedPreferences.getBoolean(WEBAPK_RUNTIME_KEY, false);
     }
 
     /** Writes the cached value for the webapk feature is enabled. */
     public void setCachedWebApkRuntimeEnabled(boolean isEnabled) {
         writeBoolean(WEBAPK_RUNTIME_KEY, isEnabled);
     }
 
@@ skipping 88 matching lines @@
      *
      * @param key The name of the preference to modify.
      * @param value The new value for the preference.
      */
     private void writeBoolean(String key, boolean value) {
         SharedPreferences.Editor ed = mSharedPreferences.edit();
         ed.putBoolean(key, value);
         ed.apply();
     }
 }