Remove base dependency from webapk/libs/client

chrome/android/webapk/libs/client/BUILD.gn

 # 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.
 
 import("//build/config/android/rules.gni")
 
 android_library("client") {
   java_files = [
     "src/org/chromium/webapk/lib/client/DexOptimizer.java",
     "src/org/chromium/webapk/lib/client/WebApkServiceConnectionManager.java",
     "src/org/chromium/webapk/lib/client/WebApkValidator.java",
   ]
   deps = [
-    "//base:base_java",
     "//chrome/android/webapk/libs/common",
   ]
   srcjar_deps =
       [ "//chrome/android/webapk/libs/runtime_library:webapk_service_aidl" ]
 }
 
 junit_binary("webapk_client_junit_tests") {
   java_files =
       [ "junit/src/org/chromium/webapk/lib/client/WebApkValidatorTest.java" ]
   deps = [
     ":client",
     "//base:base_junit_test_support",
   ]
 }