Remove MOJO_SHELL_CLIENT define.

chrome/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/chrome_tests.gni")
@@ skipping 882 matching lines @@
 
     deps += [
       "//services/shell/background:lib",
       "//services/shell/background/tests:test_support",
     ]
 
     data_deps = [
       "//chrome/app:mojo_manifests",
       "//mash/session",
     ]
-
-    defines = [ "MOJO_SHELL_CLIENT" ]
   }
 }
 
 test("browser_tests") {
   sources = rebase_path(chrome_tests_gypi_values.chrome_browser_tests_sources,
                         ".",
                         "//chrome")
 
   configs += [
     "//build/config:precompiled_headers",
@@ skipping 1584 matching lines @@
 if (is_android) {
   android_library("unit_tests_java") {
     java_files = [ "android/unit_tests_apk/src/org/chromium/chrome/unit_tests_apk/ChromeNativeTestApplication.java" ]
     deps = [
       "//base:base_java",
       "//chrome/android:chrome_java",
       "//content/public/android:content_java",
     ]
   }
 }