Extract external file systems handling from isolated context.

content/content_tests.gypi

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       'target_name': 'test_support_content',
       'type': 'static_library',
       'defines!': ['CONTENT_IMPLEMENTATION'],
@@ skipping 564 matching lines @@
           'dependencies': [
             '../third_party/iaccessible2/iaccessible2.gyp:iaccessible2',
           ],
         }],
         ['OS=="mac"', {
           # These flags are needed to run the test on Mac.
           # Search for comments about "xcode_settings" in chrome_tests.gypi.
           'xcode_settings': {'OTHER_LDFLAGS': ['-Wl,-ObjC']},
         }],
         ['chromeos==1', {
+          'sources': [
+              '../webkit/chromeos/fileapi/cros_mount_point_provider_unittest.cc'
+          ],
           'sources/': [
             ['exclude', '^browser/renderer_host/gtk_key_bindings_handler_unittest.cc'],
           ],
         }],
         ['use_aura==1', {
           'dependencies': [
             '../ui/aura/aura.gyp:aura',
           ],
           'sources!': [
             'browser/accessibility/browser_accessibility_win_unittest.cc',
@@ skipping 357 matching lines @@
             'resource_dir': '../res',
             'additional_src_dirs': ['../content/public/android/javatests/'],
             'is_test_apk': 1,
           },
           'includes': [ '../build/java_apk.gypi' ],
         },
       ],
     }],
   ],
 }