Roll src/third_party/cros_system_api/ c0be49956..71adbf6a5 (1 commit)

https://chromium.googlesource.com/chromiumos/platform/system_api.git/+log/c0be499563b8..71adbf6a5686

$ git log c0be49956..71adbf6a5 --date=short --no-merges --format='%ad %ae %s'
2018-08-13 mortonm service_constants: Add constant for IsShillSandboxingEnabled dbus method.

Created with:
  roll-dep src/third_party/cros_system_api

Bug: chromium:649417
Change-Id: I749d030144f94ad1e30e6a62eaaf2d45007b5cb7
Reviewed-on: https://chromium-review.googlesource.com/1177883Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Micah Morton <mortonm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583719}

DEPS

@@ -567,7 +567,7 @@ deps = {
 
   # For Linux and Chromium OS.
   'src/third_party/cros_system_api': {
-      'url': Var('chromium_git') + '/chromiumos/platform/system_api.git' + '@' + 'c0be499563b84ec733af9fea34b6ae74d9667003',
+      'url': Var('chromium_git') + '/chromiumos/platform/system_api.git' + '@' + '71adbf6a56865ae5500686eaa221b0f988c3bada',
       'condition': 'checkout_linux',
   },