Enable mute button, even if preferring hidden volume slider.

LayoutTests/media/video-controls-hidden-audio.html

Index: LayoutTests/media/video-controls-hidden-audio.html
diff --git a/LayoutTests/media/video-controls-hidden-audio.html b/LayoutTests/media/video-controls-hidden-audio.html
index 1eb707f83de764733fd6f70fb1ebeb1c34af475c..c694a61a97052a93a5e40f9639e088db1366b234 100644
--- a/LayoutTests/media/video-controls-hidden-audio.html
+++ b/LayoutTests/media/video-controls-hidden-audio.html
@@ -9,7 +9,7 @@
     waitForEvent("canplaythrough", function () {
         // Enable hidden audio preferences to take effect.
         run("window.internals.setAllowHiddenVolumeControls(video, true)");
-        // Request non-hidden audio.
+        // Request non-hidden audio controls.
         run("window.internals.settings.setPreferHiddenVolumeControls(false)");
         run("video.muted = false");
         muteButton = mediaControlsButton(video, "mute-button");
@@ -19,11 +19,8 @@
         testExpected("getComputedStyle(muteButton).display", "none", '!=');
         testExpected("getComputedStyle(volumeSlider).display", "none", '!=');
 
-        // Switch to muted video.  Both should still be visible.  We then
-        // remind it that we'd like to allow hidden audio preferences, since
-        // that also resets some state.
+        // Switch to muted video.  Both should still be visible.
         run("video.muted = true");
-        run("window.internals.setAllowHiddenVolumeControls(video, true)");
         testExpected("getComputedStyle(muteButton).display", "none", '!=');
         testExpected("getComputedStyle(volumeSlider).display", "none", '!=');
 
@@ -31,15 +28,14 @@
 
         // Switch back to unmuted video.
         run("video.muted = false");
-        run("window.internals.setAllowHiddenVolumeControls(video, true)");
 
-        testExpected("getComputedStyle(muteButton).display", "none", '==');
+        testExpected("getComputedStyle(muteButton).display", "none", '!=');
         testExpected("getComputedStyle(volumeSlider).display", "none", '==');
 
         // For muted video, the volume slider will hide but the mute
-        // button should come back, to let the user unmute.
+        // button should stay, since we always have it present for media
+        // which have audio.
         run("video.muted = true");
-        run("window.internals.setAllowHiddenVolumeControls(video, true)");
         testExpected("getComputedStyle(muteButton).display", "none", '!=');
         testExpected("getComputedStyle(volumeSlider).display", "none", '==');