Roll src/third_party/cros_system_api c74bf51d..f5afa58d

https://chromium.googlesource.com/chromiumos/platform/system_api.git/+log/c74bf51d..f5afa58d

$ git log c74bf51d..f5afa58d  --date=short --no-merges --format='%ad %ae %s'
2016-08-13 cylee@chromium.org DBus constants: Add a new method SetOomScoreAdj in debugd interface.
2016-07-26 tnagel@chromium.org login_manager: Remove unused D-Bus constants.
2016-07-21 nya@chromium.org Revert "Add a constant for GetFreeDiskSpace()."

BUG=

Review-Url: https://codereview.chromium.org/2272163004
Cr-Commit-Position: refs/heads/master@{#414477}

DEPS

@@ -380,7 +380,7 @@ deps_os = {
 
     # For Linux and Chromium OS.
     'src/third_party/cros_system_api':
-     Var('chromium_git') + '/chromiumos/platform/system_api.git' + '@' + 'c74bf51d2bc256adf09b6cfb2e353262fa43a736',
+     Var('chromium_git') + '/chromiumos/platform/system_api.git' + '@' + 'f5afa58d82ba25eff525ff4800732d65f6417a7e',
 
     # Note that this is different from Android's freetype repo.
     'src/third_party/freetype2/src':