Get rid of excessive CrosSettings::Get()->Set*() usage, mostly in tests.
The following tests were affected:
unit_tests:
AttestationPolicyObserverTest.*
CryptohomeAuthenticatorTest.*
ExtensionCacheTest.*
EPKPChallengeMachineKeyTest.DevicePolicyDisabled
EPKPChallengeUserKeyTest.DevicePolicyDisabled
HeartbeatSchedulerTest.*
NetworkConfigurationUpdaterTest.*
PlatformVerificationFlowTest.*
StatusUploaderTest.*
ShutdownPolicyHandlerTest.*
UserManagerTest.*
browser_tests:
DeviceStatusCollectorTest.*
KioskAppManagerTest.*
KioskEnterpriseTest.*
KioskTest.*
KioskUpdateTest.*
BUG=433840
Review URL: https://codereview.chromium.org/
1019283004
Cr-Commit-Position: refs/heads/master@{#326338}