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

chrome/common/chrome_switches.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "ppapi/features/features.h"
@@ skipping 947 matching lines @@
 const char kEnableContextualSearchContextualCardsBarIntegration[] =
     "cs-contextual-cards-bar-integration";
 
 // Enables chrome hosted mode for Android.
 const char kEnableHostedMode[] = "enable-hosted-mode";
 
 // Enables a hung renderer InfoBar allowing the user to close or wait on
 // unresponsive web content.
 const char kEnableHungRendererInfoBar[] = "enable-hung-renderer-infobar";
 
-// Enables "Add to Home screen" in the app menu to generate WebAPKs.
-const char kEnableWebApk[] = "enable-improved-a2hs";
-
 // Forces the update menu badge to show.
 const char kForceShowUpdateMenuBadge[] = "force-show-update-menu-badge";
 
 // Forces the update menu item to show.
 const char kForceShowUpdateMenuItem[] = "force-show-update-menu-item";
 
 // Forces a custom summary to be displayed below the update menu item.
 const char kForceShowUpdateMenuItemCustomSummary[] = "custom_summary";
 
 // Forces the new features summary to be displayed below the update menu item.
@@ skipping 274 matching lines @@
 
 // -----------------------------------------------------------------------------
 // DO NOT ADD YOUR VERY NICE FLAGS TO THE BOTTOM OF THIS FILE.
 //
 // You were going to just dump your switches here, weren't you? Instead, please
 // put them in alphabetical order above, or in order inside the appropriate
 // ifdef at the bottom. The order should match the header.
 // -----------------------------------------------------------------------------
 
 }  // namespace switches