Rename --enable-default-media-session to --enable-audio-focus.

chrome/browser/chromeos/accessibility/accessibility_manager.cc

Index: chrome/browser/chromeos/accessibility/accessibility_manager.cc
diff --git a/chrome/browser/chromeos/accessibility/accessibility_manager.cc b/chrome/browser/chromeos/accessibility/accessibility_manager.cc
index 069ca6d6f4d9c86ddbe199c005bc306bbc8845ad..954dcef2caac2ba5d1c317430caa0da04b6b89f1 100644
--- a/chrome/browser/chromeos/accessibility/accessibility_manager.cc
+++ b/chrome/browser/chromeos/accessibility/accessibility_manager.cc
@@ -1471,9 +1471,9 @@ void AccessibilityManager::PostLoadChromeVox() {
   }
 
   if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-          switches::kEnableDefaultMediaSession)) {
+          switches::kEnableAudioFocus)) {
     base::CommandLine::ForCurrentProcess()->AppendSwitch(
-        switches::kEnableDefaultMediaSession);
+        switches::kEnableAudioFocus);
   }
 }