file_manager: Remove file_manager_extension=0 section from chrome_browser_chromeos.gypi

This configuration has been broken for long time, and fixing it is a non-trivial
work without much benefit. For now, let's simplify the GYPI file so we don't have
to touch the broken part.

BUG=273386
TEST=none

Review URL: https://chromiumcodereview.appspot.com/23942002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221286 0039d316-1c4b-4281-b951-d872f2087c98

chrome/chrome_browser_chromeos.gypi

@@ -900,24 +900,6 @@
             'USE_CRAS',
           ],          
         }],
-        ['file_manager_extension==0', {
-          'sources/': [
-            ['exclude', 'browser/chromeos/extensions/file_manager/file_browser_handler_api.cc'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/file_browser_handler_api.h'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/file_browser_private_api.cc'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/file_browser_private_api.h'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/file_browser_private_api_factory.cc'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/file_browser_private_api_factory.h'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/file_tasks.cc'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/file_tasks.h'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/open_util.cc'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/open_util.h'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/zip_file_creator.cc'],
-            ['exclude', 'browser/chromeos/extensions/file_manager/zip_file_creator.h'],
-            ['exclude', 'browser/chromeos/extensions/media_player_api.cc'],
-            ['exclude', 'browser/chromeos/extensions/media_player_api.h'],
-          ],
-        }],
         ['use_ash==1', {
           'dependencies': [
             '../ash/ash.gyp:ash',