Update filters/mojo.fyi.network_browser_tests.filter.

Remove several tests that have been renamed, and annotate two other sets
of tests with more details and new bugs.

Bug: 769401
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: Ic8d7b9158ebb6b3c551546c83639e3ad1431db26
Reviewed-on: https://chromium-review.googlesource.com/1164313Reviewed-by: Maks Orlovich <morlovich@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581267}

testing/buildbot/filters/mojo.fyi.network_browser_tests.filter

@@ -17,8 +17,9 @@
 -WebViewTest.WebViewInBackgroundPage
 
 # These tests uses net::URLRequestFilter (through TestRequestInterceptor) to
-# mock out network responses. Unclear if the code being tested uses
-# SimpleURLLoader or URLFetcher.
+# mock out network responses, and use ExtensionDownloader to issue requests,
+# which has yet to be switched from URLFetcher.
+# https://crbug.com/844928
 -PolicyTest.ExtensionInstallBlacklistSharedModules
 -PolicyTest.ExtensionInstallForcelist
 -PolicyTest.ExtensionInstallForcelist_DefaultedUpdateUrl
@@ -26,6 +27,11 @@
 -PolicyTest.ExtensionMinimumVersionRequired
 -PolicyTest.ExtensionMinimumVersionRequiredAlt
 -PolicyTest.ExtensionRecommendedInstallationMode
+
+# These tests uses net::URLRequestFilter (through TestRequestInterceptor) to
+# mock out network responses, and use URLFetcherDownloader to issue requests,
+# which has yet to be switched from URLFetcher.
+# https://crbug.com/871542
 -PolicyUpdateServiceTest.Backoff
 -PolicyUpdateServiceTest.FailedUpdateRetries
 -PolicyUpdateServiceTest.PolicyCorruptedOnStartup
@@ -140,8 +146,6 @@
 -DnsProbeBrowserTest.NoInternetProbeResultWithSlowBrokenCorrections
 
 # crbug.com/776589 Intercepting requests with net::URLRequestFilter.
--PolicyTest.CertificateTransparencyEnforcementDisabledForUrls/0
--PolicyTest.CertificateTransparencyEnforcementDisabledForUrls/1
 -PolicyTest.ExtensionInstallSources
 
 # crbug.com/859594 Migrate storage::FileWriterDelegate to use SimpleURLLoader