linux_aura: Turn it on again.

chrome/chrome_tests.gypi

 # Copyright 2013 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.
 {
   'variables' : {
     'chromedriver_unittest_sources': [
       'test/chromedriver/capabilities_unittest.cc',
       'test/chromedriver/chrome/chrome_finder_unittest.cc',
       'test/chromedriver/chrome/console_logger_unittest.cc',
       'test/chromedriver/chrome/device_manager_unittest.cc',
@@ skipping 1708 matching lines @@
         ['debug_devtools==1', {
           'defines': [
             'DEBUG_DEVTOOLS=1',
           ],
         }],
         ['use_ash==1', {
           'dependencies': [
             '../ash/ash.gyp:ash_test_support',
           ],
         }],
+        ['use_aura==1 and desktop_linux==1', {
+          'sources!': [
+            # TODO(erg): A large number of the PPAPI browsertests flakily
+            # timeout.
+            'test/ppapi/ppapi_browsertest.cc',
+          ],
+        }],
         ['chromeos==0', {
           'sources/': [
             ['exclude', '^browser/chromeos'],
             ['exclude', '^browser/ui/webui/options/chromeos/'],
           ],
           'sources!': [
             'browser/extensions/api/terminal/terminal_private_apitest.cc',
             'browser/ui/ash/caps_lock_delegate_chromeos_browsertest.cc',
             'test/data/webui/certificate_viewer_dialog_test.js',
             'test/data/webui/certificate_viewer_ui_test-inl.h',
@@ skipping 1483 matching lines @@
             'utility',
           ],
           'sources': [
             'tools/service_discovery_sniffer/service_discovery_sniffer.h',
             'tools/service_discovery_sniffer/service_discovery_sniffer.cc',
           ],
         }]
     }],
   ],  # 'conditions'
 }