I noticed the following in the unit test output:

[----------] 5 tests from SubresourceFilterComponentInstallerTest
[ RUN      ] SubresourceFilterComponentInstallerTest.TestComponentRegistrationWhenFeatureDisabled
[       OK ] SubresourceFilterComponentInstallerTest.TestComponentRegistrationWhenFeatureDisabled (2 ms)
[ RUN      ] SubresourceFilterComponentInstallerTest.TestComponentRegistrationWhenFeatureEnabled
[3846:3846:1026/082327:3939062811:ERROR:default_component_installer.cc(342)] Component registration failed for Subresource Filter Rules
[       OK ] SubresourceFilterComponentInstallerTest.TestComponentRegistrationWhenFeatureEnabled (3 ms)
[ RUN      ] SubresourceFilterComponentInstallerTest.LoadEmptyRuleset
[       OK ] SubresourceFilterComponentInstallerTest.LoadEmptyRuleset (5 ms)
[ RUN      ] SubresourceFilterComponentInstallerTest.FutureVersionIgnored
[       OK ] SubresourceFilterComponentInstallerTest.FutureVersionIgnored (3 ms)
[ RUN      ] SubresourceFilterComponentInstallerTest.LoadFileWithData
[       OK ] SubresourceFilterComponentInstallerTest.LoadFileWithData (3 ms)
[----------] 5 tests from SubresourceFilterComponentInstallerTest (28 ms total)

[----------] 3 tests from SupervisedUserWhitelistInstallerTest
[ RUN      ] SupervisedUserWhitelistInstallerTest.GetHashFromCrxId
[       OK ] SupervisedUserWhitelistInstallerTest.GetHashFromCrxId (5 ms)
[ RUN      ] SupervisedUserWhitelistInstallerTest.InstallNewWhitelist
[       OK ] SupervisedUserWhitelistInstallerTest.InstallNewWhitelist (8 ms)
[ RUN      ] SupervisedUserWhitelistInstallerTest.RegisterAndUninstallExistingWhitelist
[3846:3846:1026/082327:3939111488:ERROR:default_component_installer.cc(318)] Couldn't delete /tmp/.org.chromium.Chromium.UazgGu/SupervisedUserWhitelists/abcdefghijklmnopponmlkjihgfedcba