Roll src/third_party/cros_system_api/ 0418b5904..db31812cb (5 commits)

https://chromium.googlesource.com/chromiumos/platform2/system_api.git/+log/0418b5904157..db31812cb239

$ git log 0418b5904..db31812cb --date=short --no-merges --format='%ad %ae %s'
2019-08-12 voit login: Add LoginScreeenStorage ListKeys() and Delete() methods.
2019-08-14 kimjae dlcservice: Error and Status propagation
2019-06-12 smbarber system_api: add ConnectChunnel method to vm_cicerone
2019-06-12 smbarber system_api: add chunneld D-Bus interface
2019-08-19 akhouderchah system_api: shill: Remove unused kTypeWimax constant

Created with:
  roll-dep src/third_party/cros_system_api

Bug: 980171
Change-Id: If66124da790bfa081429c50ef58eaec994426147
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1789235
Commit-Queue: Zakhar Voit <voit@google.com>
Commit-Queue: Alexander Hendrich <hendrich@chromium.org>
Auto-Submit: Zakhar Voit <voit@google.com>
Reviewed-by: Alexander Hendrich <hendrich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694259}

DEPS

@@ -857,7 +857,7 @@ deps = {
 
   # For Linux and Chromium OS.
   'src/third_party/cros_system_api': {
-      'url': Var('chromium_git') + '/chromiumos/platform2/system_api.git' + '@' + '0418b5904157571bc06d3be3af38f17296feb9c4',
+      'url': Var('chromium_git') + '/chromiumos/platform2/system_api.git' + '@' + 'db31812cb2392fe5565076b26fa46084c4bcbd88',
       'condition': 'checkout_linux',
   },