Remove untrusted sources installation flow.

chrome/browser/android/webapk/chrome_webapk_host.cc

 // Copyright 2016 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/browser/android/webapk/chrome_webapk_host.h"
 
 #include "chrome/browser/android/chrome_feature_list.h"
 #include "components/variations/variations_associated_data.h"
 #include "jni/ChromeWebApkHost_jni.h"
 
@@ skipping 24 matching lines @@
 }
 
 // static
 jboolean CanLaunchRendererInWebApkProcess(
     JNIEnv* env,
     const base::android::JavaParamRef<jclass>& clazz) {
   return variations::GetVariationParamValueByFeature(
              chrome::android::kImprovedA2HS, kLaunchRendererInWebApkProcess) ==
          "true";
 }
-
-// static
-jboolean CanInstallFromUnknownSources(
-    JNIEnv* env,
-    const base::android::JavaParamRef<jclass>& clazz) {
-  return base::FeatureList::GetInstance()->IsFeatureOverriddenFromCommandLine(
-             chrome::android::kImprovedA2HS.name,
-             base::FeatureList::OVERRIDE_ENABLE_FEATURE);
-}