Roll src/third_party/cros_system_api/ 51c84139d..7aaece4a0 (5 commits)

https://chromium.googlesource.com/chromiumos/platform/system_api.git/+log/51c84139d960..7aaece4a0870

$ git log 51c84139d..7aaece4a0 --date=short --no-merges --format='%ad %ae %s'
2018-04-10 derat system_api: Add type field to PowerSource message.
2018-03-16 allenvic smbprovider: Add auth params for MountOptionsProto
2018-04-06 jkardatzke Constants for D-Bus server for opening URLs with Chrome
2018-04-06 timzheng Add D-Bus call to concierge for getting icons.
2018-03-18 claudiomagni Add main mojom files for the ML Service API.

Created with:
  roll-dep src/third_party/cros_system_api

R=jkardatzke@chromium.org

Bug: None
Change-Id: I89147d8d0f92f8968f117789296578db637b8867
Reviewed-on: https://chromium-review.googlesource.com/1011124Reviewed-by: James Hawkins <jhawkins@chromium.org>
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Cr-Commit-Position: refs/heads/master@{#550478}

DEPS

@@ -500,7 +500,7 @@ deps = {
 
   # For Linux and Chromium OS.
   'src/third_party/cros_system_api': {
-      'url': Var('chromium_git') + '/chromiumos/platform/system_api.git' + '@' + '51c84139d960c61e89fdab37092a00599a78c7bd',
+      'url': Var('chromium_git') + '/chromiumos/platform/system_api.git' + '@' + '7aaece4a0870323c3a1e5d3f7afecd7b15e188ae',
       'condition': 'checkout_linux',
   },