Android: Remove unneeded RegisterNatives() calls

components/bookmarks/common/android/BUILD.gn

 # Copyright 2014 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/rules.gni")
 
 # GYP: //components/bookmarks.gyp:bookmarks_browser (android part)
 source_set("android") {
   sources = [
     "bookmark_id.cc",
     "bookmark_id.h",
     "bookmark_type.h",
-    "component_jni_registrar.cc",
-    "component_jni_registrar.h",
   ]
   deps = [
     ":bookmarks_jni_headers",
     "//base:base",
   ]
 }
 
 # GYP: //components/bookmarks.gyp:bookmarks_java
 android_library("bookmarks_java") {
   deps = [
@@ skipping 10 matching lines @@
     "java/src/org/chromium/components/bookmarks/BookmarkId.java",
   ]
 }
 
 # GYP: //components/bookmarks.gyp:bookmarks_type_java
 java_cpp_enum("bookmark_type_javagen") {
   sources = [
     "bookmark_type.h",
   ]
 }