Switch mash_browser_tests to Ozone X11 platform.

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/common/features.gni")
@@ skipping 1157 matching lines @@
     deps = [
       ":mash_browser_tests",
     ]
   }
 
   group("mash_browser_tests") {
     testonly = true
     data_deps = [
       ":browser_tests",
     ]
+
+    if (use_aura) {
+      data_deps += [ "//chrome/app/mash:mash_service_overrides" ]
+    }
   }
 }
 
 static_library("browser_tests_runner") {
   testonly = true
   sources = []
 
   deps = [
     ":test_support",
   ]
@@ skipping 3975 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }