Extract external file systems handling from isolated context.

content/content_tests.gypi

Index: content/content_tests.gypi
diff --git a/content/content_tests.gypi b/content/content_tests.gypi
index 437d4bc71ae0c0daefcd4b7c27f9f4eee1f8f2a7..4b858a2420c5aa5329ee374ed40dfa3fe038ab82 100644
--- a/content/content_tests.gypi
+++ b/content/content_tests.gypi
@@ -403,6 +403,7 @@
         '../webkit/blob/mock_blob_url_request_context.cc',
         '../webkit/blob/mock_blob_url_request_context.h',
         '../webkit/blob/shareable_file_reference_unittest.cc',
+        '../webkit/chromeos/fileapi/cros_mount_point_provider_unittest.cc',
         '../webkit/database/database_connections_unittest.cc',
         '../webkit/database/database_quota_client_unittest.cc',
         '../webkit/database/databases_table_unittest.cc',
@@ -414,6 +415,7 @@
         '../webkit/dom_storage/dom_storage_database_unittest.cc',
         '../webkit/dom_storage/dom_storage_map_unittest.cc',
         '../webkit/dom_storage/session_storage_database_unittest.cc',
+        '../webkit/fileapi/external_mount_points_unittest.cc',
         '../webkit/fileapi/file_system_database_test_helper.cc',
         '../webkit/fileapi/file_system_database_test_helper.h',
         '../webkit/fileapi/file_system_directory_database_unittest.cc',
@@ -589,6 +591,10 @@
           'sources/': [
             ['exclude', '^browser/renderer_host/gtk_key_bindings_handler_unittest.cc'],
           ],
+        }, {  # chromeos!=1
+          'sources/': [
+            ['exclude', '^../webkit/chromeos/'],

[jam, 2013/01/15 01:37:10]

are you sure you need this? the file filters should already be doing this...

[tbarzic, 2013/01/15 02:11:27]

it didn't compile on Linux without this..

[jam, 2013/01/15 20:52:45]

ah, looks like filename_rules.gypi is missing an entry for directories named
"chromeos". can you please fix it there instead of here? with that, lgtm

+          ],
         }],
         ['use_aura==1', {
           'dependencies': [