DeviceScheduledUpdateChecker: Increase network wait timeout

This change increments the network wait timeout from 1 minute to 5
minutes. This is done because after manual testing it was found that it
could take up to just over a minute for shill to notify Chrome of a
network change. 5 minutes is used as the absolute worst case.

BUG=924762
TEST=Unit tests.

Change-Id: I60a412930f379fd7639d01e9c856c0443e8ef14a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1757460
Commit-Queue: Abhishek Bhardwaj <abhishekbh@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691022}

chrome/browser/chromeos/policy/scheduled_update_checker/os_and_policies_update_checker.h

@@ -32,9 +32,10 @@ constexpr base::TimeDelta kOsAndPoliciesUpdateCheckerRetryTime =
 
 // Time for which |OsAndPoliciesUpdateChecker| will wait for a valid network
 // before querying the update server for updates. After this time it will return
-// a failure.
+// a failure. During testing it was noted that on average 1 minute seemed to be
+// the delay after which a network would be detected by Chrome.
 constexpr base::TimeDelta kWaitForNetworkTimeout =
-    base::TimeDelta::FromMinutes(1);
+    base::TimeDelta::FromMinutes(5);
 
 }  // namespace update_checker_internal