Move browser-agnostic code from file_system_util to file_system_core_util.

chrome/chrome_browser_chromeos.gypi

Index: chrome/chrome_browser_chromeos.gypi
diff --git a/chrome/chrome_browser_chromeos.gypi b/chrome/chrome_browser_chromeos.gypi
index 51996a402de2535390cc8964d1dcfde2131c412f..de468a223309f72c89e3f59ffbeae14bc2d5c93a 100644
--- a/chrome/chrome_browser_chromeos.gypi
+++ b/chrome/chrome_browser_chromeos.gypi
@@ -148,6 +148,8 @@
         'browser/chromeos/drive/file_system/touch_operation.h',
         'browser/chromeos/drive/file_system/truncate_operation.cc',
         'browser/chromeos/drive/file_system/truncate_operation.h',
+        'browser/chromeos/drive/file_system_core_util.cc',
+        'browser/chromeos/drive/file_system_core_util.h',
         'browser/chromeos/drive/file_system_interface.cc',
         'browser/chromeos/drive/file_system_interface.h',
         'browser/chromeos/drive/file_system_metadata.cc',
@@ -508,12 +510,12 @@
         'browser/chromeos/login/profile_auth_data.cc',
         'browser/chromeos/login/profile_auth_data.h',
         'browser/chromeos/login/proxy_settings_dialog.h',
+        'browser/chromeos/login/reauth_stats.cc',
+        'browser/chromeos/login/reauth_stats.h',
         'browser/chromeos/login/saml/saml_offline_signin_limiter.cc',
         'browser/chromeos/login/saml/saml_offline_signin_limiter.h',
         'browser/chromeos/login/saml/saml_offline_signin_limiter_factory.cc',
         'browser/chromeos/login/saml/saml_offline_signin_limiter_factory.h',
-        'browser/chromeos/login/reauth_stats.cc',
-        'browser/chromeos/login/reauth_stats.h',
         'browser/chromeos/login/screen_manager.cc',
         'browser/chromeos/login/screen_manager.h',
         'browser/chromeos/login/screens/base_screen.cc',
@@ -857,14 +859,14 @@
         'browser/chromeos/policy/recommendation_restorer.h',
         'browser/chromeos/policy/recommendation_restorer_factory.cc',
         'browser/chromeos/policy/recommendation_restorer_factory.h',
+        'browser/chromeos/policy/remote_commands/affiliated_remote_commands_invalidator.cc',
+        'browser/chromeos/policy/remote_commands/affiliated_remote_commands_invalidator.h',
         'browser/chromeos/policy/remote_commands/device_command_reboot_job.cc',
         'browser/chromeos/policy/remote_commands/device_command_reboot_job.h',
         'browser/chromeos/policy/remote_commands/device_command_screenshot_job.cc',
         'browser/chromeos/policy/remote_commands/device_command_screenshot_job.h',
         'browser/chromeos/policy/remote_commands/device_commands_factory_chromeos.cc',
         'browser/chromeos/policy/remote_commands/device_commands_factory_chromeos.h',
-        'browser/chromeos/policy/remote_commands/affiliated_remote_commands_invalidator.cc',
-        'browser/chromeos/policy/remote_commands/affiliated_remote_commands_invalidator.h',
         'browser/chromeos/policy/remote_commands/screenshot_delegate.cc',
         'browser/chromeos/policy/remote_commands/screenshot_delegate.h',
         'browser/chromeos/policy/server_backed_device_state.cc',