Roll src/third_party/cros_system_api/ 9f4be0e52..70439a4af (1 commit)

https://chromium.googlesource.com/chromiumos/platform2/system_api.git/+log/9f4be0e52d52..70439a4af4be

$ git log 9f4be0e52..70439a4af --date=short --no-merges --format='%ad %ae %s'
2020-05-21 fletcherw system_api: add ListScannersResponse proto

Created with:
  roll-dep src/third_party/cros_system_api

Bug: b:157577191
Change-Id: Icd1bf545c3a6633a4bbc10c26f0886a87c75f472
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224914
Auto-Submit: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773731}

DEPS

@@ -866,7 +866,7 @@ deps = {
 
   # For Linux and Chromium OS.
   'src/third_party/cros_system_api': {
-      'url': Var('chromium_git') + '/chromiumos/platform2/system_api.git' + '@' + '9f4be0e52d5202130dca0ca5e39522b3c35a01dd',
+      'url': Var('chromium_git') + '/chromiumos/platform2/system_api.git' + '@' + '70439a4af4be14da0243a33f9c51c0467fbeb6b3',
       'condition': 'checkout_linux',
   },