Use mojo for WebappRegistry.

chrome/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/config.gni")
 import("//build/config/android/rules.gni")
 import("//build_overrides/v8.gni")
 import("//chrome/android/chrome_public_apk_tmpl.gni")
 import("//chrome/common/features.gni")
 import("//chrome/version.gni")
@@ skipping 130 matching lines @@
   ]
 }
 
 # GYP: //chrome/chrome.gyp:chrome_java
 android_library("chrome_java") {
   deps = [
     ":chrome_public_apk_manifest",
     "//base:base_java",
     "//chrome/android/webapk/libs/client:client_java",
     "//chrome/android/webapk/libs/common:common_java",
+    "//chrome/browser:webapp_registry_mojom_java",
     "//components/safe_json/android:safe_json_java",
     "//components/variations/android:variations_java",
     "//components/web_contents_delegate_android:web_contents_delegate_android_java",
     "//components/web_restrictions:web_restrictions_java",
     "//content/public/android:content_java",
     "//device/geolocation:geolocation_java",
     "//media/base/android:media_java",
     "//media/capture/content/android:screen_capture_java",
     "//media/capture/video/android:capture_java",
     "//media/midi:midi_java",
@@ skipping 140 matching lines @@
 # GYP: //chrome/chrome_tests.gypi:chrome_junit_tests
 junit_binary("chrome_junit_tests") {
   # From java_sources.gni.
   java_files = chrome_junit_test_java_sources
   deps = [
     ":chrome_java",
     ":chrome_java_resources",
     "//base:base_java",
     "//base:base_java_test_support",
     "//base:base_junit_test_support",
+    "//chrome/browser:webapp_registry_mojom_java",
     "//components/bookmarks/common/android:bookmarks_java",
     "//components/invalidation/impl:java",
     "//components/sync:sync_java_test_support",
     "//components/sync/android:sync_java",
     "//components/web_restrictions:web_restrictions_java",
     "//content/public/android:content_java",
     "//device/geolocation:geolocation_java",
+    "//mojo/public/java:bindings",
+    "//mojo/public/java:system",
     "//net/android:net_java",
     "//third_party/WebKit/public:blink_headers_java",
     "//third_party/android_tools:android_support_v7_mediarouter_java",
     "//third_party/android_tools:android_support_v7_recyclerview_java",
     "//third_party/cacheinvalidation:cacheinvalidation_javalib",
     "//third_party/junit:hamcrest",
     "//ui/android:ui_java",
     google_play_services_library,
   ]
 }
@@ skipping 26 matching lines @@
   testonly = true
 
   # From java_sources.gni.
   java_files = chrome_test_java_sources
 
   deps = [
     "//base:base_java",
     "//base:base_java_test_support",
     "//chrome/android:chrome_java",
     "//chrome/android/webapk/libs/common:common_java",
+    "//chrome/browser:webapp_registry_mojom_java",
     "//chrome/test/android:chrome_java_test_support",
     "//components/bookmarks/common/android:bookmarks_java",
     "//components/dom_distiller/android:dom_distiller_core_java",
     "//components/gcm_driver/android:gcm_driver_java",
     "//components/invalidation/impl:java",
     "//components/invalidation/impl:javatests",
     "//components/location/android:location_java",
     "//components/navigation_interception/android:navigation_interception_java",
     "//components/policy/android:policy_java",
     "//components/precache/android:precache_java",
@@ skipping 249 matching lines @@
     apk_name = "ChromeSyncShellTest"
     apk_under_test = ":chrome_sync_shell_apk"
     android_manifest = chrome_sync_shell_test_apk_manifest
     android_manifest_dep = ":chrome_sync_shell_test_apk_manifest"
     deps = [
       ":chrome_sync_shell_test_apk_java",
     ]
     proguard_enabled = !is_java_debug
   }
 }