Move use_webview_internal_framework to android_webview/BUILD.gn

android_webview/BUILD.gn

 # 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.
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build/config/locales.gni")
 import("//tools/grit/repack.gni")
 import("system_webview_apk_tmpl.gni")
 import("webview_repack_locales.gni")
 
+if (!defined(use_webview_internal_framework)) {
+  use_webview_internal_framework = false
+}
+
 group("android_webview") {
   if (!use_webview_internal_framework) {
     deps = [
       ":system_webview_apk",
     ]
   }
 }
 
 jinja_template("system_webview_manifest") {
   input = "apk/java/AndroidManifest.xml"
@@ skipping 616 matching lines @@
     android_manifest = get_target_outputs(":system_webview_manifest")
     android_manifest = android_manifest[1]
     android_manifest_dep = ":system_webview_manifest"
     deps = [
       ":system_webview_resources",
       "//android_webview/glue",
     ]
     apk_name = "SystemWebView"
   }
 }