[Android WebAPK] Make variations only control whether WebAPKs can be installed

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.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.webapps;
 
 import android.app.Activity;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Build;
@@ skipping 224 matching lines @@
     }
 
     /**
      * Checks whether the WebAPK package specified in the intent is a valid WebAPK and whether the
      * url specified in the intent can be fulfilled by the WebAPK.
      *
      * @param intent The intent
      * @return true iff all validation criteria are met.
      */
     private boolean isValidWebApk(Intent intent) {
-        if (!ChromeWebApkHost.isEnabled()) return false;
-
         String webApkPackage =
                 IntentUtils.safeGetStringExtra(intent, WebApkConstants.EXTRA_WEBAPK_PACKAGE_NAME);
         if (TextUtils.isEmpty(webApkPackage)) return false;
 
         String url = IntentUtils.safeGetStringExtra(intent, ShortcutHelper.EXTRA_URL);
         if (TextUtils.isEmpty(url)) return false;
 
         if (!WebApkValidator.canWebApkHandleUrl(this, webApkPackage, url)) {
             Log.d(TAG, "%s is not within scope of %s WebAPK", url, webApkPackage);
             return false;
         }
         return true;
     }
 }