Fixes ac being processed when ac is off (uplift to 0.71.x)

[brave-builds]

Uplift of #3915
Fixes brave/brave-browser#6716

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[kjozwiak]

Restarting Linux due to the following failure as per https://ci.brave.com/job/brave-browser-build-pr/job/pr3915_ac-check_0.71.x/1/execution/node/333/log/:

09:28:17  [39370/39380] AR obj/components/autofill/content/renderer/librenderer.a
09:28:49  Cannot contact i-0cfb1da31655a8063: hudson.remoting.ChannelClosedException: Channel "hudson.remoting.Channel@775c553e:i-0cfb1da31655a8063": Remote call on i-0cfb1da31655a8063 failed. The channel is closing down or has closed down
09:33:48  Could not connect to i-0cfb1da31655a8063 to send interrupt signal to process

Restarting macOS due to the following failure as per https://ci.brave.com/job/brave-browser-build-pr/job/pr3915_ac-check_0.71.x/1/execution/node/543/log/:

13:25:05  [30351/38599] CXX obj/content/browser/browser/child_process_launcher_helper_mac.o
13:25:07  Sending interrupt signal to process
13:25:08  [30352/38599] CXX obj/content/browser/browser/audio_stream_monitor.o
13:25:08  [30353/38599] CXX obj/content/browser/browser/media_internals.o
13:25:12  Sending interrupt signal to process
13:25:13  ninja: build stopped: interrupted by user.
13:25:13  script returned exit code 143

Restarting Win x64 due to the following failure as per https://ci.brave.com/job/brave-browser-build-pr/job/pr3915_ac-check_0.71.x/1/execution/node/241/log/:

09:29:19  Cannot contact i-0f4ac290a4aa7ae26: hudson.remoting.ChannelClosedException: Channel "hudson.remoting.Channel@9f2fc0c:i-0f4ac290a4aa7ae26": Remote call on i-0f4ac290a4aa7ae26 failed. The channel is closing down or has closed down
09:34:28  Could not connect to i-0f4ac290a4aa7ae26 to send interrupt signal to process

[bsclifton]

++