Don't require expectations file for DumpAccessibility tests.

content/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//build_overrides/v8.gni")
 import("//media/media_options.gni")
@@ skipping 418 matching lines @@
       "//content/app/strings",
       "//net:net_resources",
       "//third_party/WebKit/public:resources",
       "//third_party/iaccessible2",
       "//third_party/isimpledom",
     ]
 
     libs = [ "oleacc.lib" ]
   }
 
-  if (is_linux) {
-    sources -=
-        [ "../browser/accessibility/dump_accessibility_tree_browsertest.cc" ]
-  }
-
   if (is_android) {
     sources += rebase_path(
             content_tests_gypi_values.content_browsertests_android_sources,
             ".",
             "//content")
     sources -=
         [ "../browser/battery_status/battery_monitor_impl_browsertest.cc" ]
     deps += [
       ":content_browsertests_java",
       ":content_browsertests_manifest",
@@ skipping 447 matching lines @@
       deps += [
         "//gpu:test_support",
         "//media/base/android",
         "//media/base/android:media_java",
         "//testing/gmock",
         "//ui/android:ui_java",
       ]
     }
   }
 }