Remove support for the keygen tag

chromecast/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/buildflag_header.gni")
 import("//build/config/features.gni")
 import("//build/config/locales.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//chromecast/build/tests/cast_test.gni")
@@ skipping 200 matching lines @@
   net_unittests_filter = {
     test_name = "net_unittests"
     if (using_sanitizer) {
       # TODO(mbjorge): net_unittests do not complete when run with sanitizers,
       # (in particular, TSAN and UBSAN), resulting in build machines getting stuck
       # for many hours. Disable them for now, since these are getting run on
       # Chromium bots anyway. (internal b/31279943)
       gtest_excludes = [ "*" ]
     } else if (target_os == "linux" && !is_cast_desktop_build) {
       # Run net_unittests first to avoid random failures due to slow python startup
-      # KeygenHandlerTest.SmokeTest and KeygenHandlerTest.ConcurrencyTest fail due to
-      # readonly certdb (b/8153161)
       # URLRequestTestHTTP.GetTest_ManyCookies takes roughly 55s to run. Increase
       # timeout to 90s from 45s to allow it to pass (b/19821476)
       # ProxyScriptFetcherImplTest.HttpMimeType is flaking (b/19848784)
       # Running a batch of net_unittests has high overhead. Run tests in batches of 50 to reduce number of batches (b/23156294).
       gtest_excludes = [
-        "KeygenHandlerTest.SmokeTest",
-        "KeygenHandlerTest.ConcurrencyTest",
         "ProxyScriptFetcherImplTest.HttpMimeType",
       ]
       args = [
         "--test-launcher-timeout=90000",
         "--test-launcher-batch-limit=50",
       ]
     } else if (is_cast_desktop_build || target_os == "android") {
       # URLRequestTestHTTP.GetTest_ManyCookies takes roughly 55s to run. Increase
       # timeout to 90s from 45s to allow it to pass (b/19821476) (b/29415636).
       # CTLogVerifierTest.VerifiesValidConsistencyProofsFromReferenceGenerator
@@ skipping 222 matching lines @@
     shared_libraries = [ "//chromecast/android:libcast_shell_android" ]
 
     deps = [
       ":cast_shell_apk_assets",
       "//base:base_java",
       "//chromecast/android:libcast_shell_android",
       "//chromecast/browser/android:cast_shell_java",
     ]
   }
 }