Make sure we are unducked after requesting a new audio focus

Bug: internal b/74159854
Test: Ran on Android Things speaker, verified bug is fixed.
Change-Id: I14b4f82c175f771cf7387d1bf6b2655221397edc
Reviewed-on: https://chromium-review.googlesource.com/1011297Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: Chris Kuiper <ckuiper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551506}

content/browser/media/session/media_session_impl.cc

@@ -579,6 +579,10 @@ bool MediaSessionImpl::RequestSystemAudioFocus(
   bool result = delegate_->RequestAudioFocus(audio_focus_type);
   uma_helper_.RecordRequestAudioFocusResult(result);
 
+  // Make sure we are unducked.
+  if (result)
+    StopDucking();
+
   // MediaSessionImpl must change its state & audio focus type AFTER requesting
   // audio focus.
   SetAudioFocusState(result ? State::ACTIVE : State::INACTIVE);