Clean up error handling logic for extension tab muting

chrome/browser/ui/tabs/tab_utils.cc

Index: chrome/browser/ui/tabs/tab_utils.cc
diff --git a/chrome/browser/ui/tabs/tab_utils.cc b/chrome/browser/ui/tabs/tab_utils.cc
index cfe6282b03aeb2d6ad9a80104fae4874f394a759..29e514420319925f94902fbb46c0ce93e99a7407 100644
--- a/chrome/browser/ui/tabs/tab_utils.cc
+++ b/chrome/browser/ui/tabs/tab_utils.cc
@@ -276,16 +276,23 @@ const std::string& GetTabAudioMutedCause(content::WebContents* contents) {
   return LastMuteMetadata::FromWebContents(contents)->cause;
 }
 
-void SetTabAudioMuted(content::WebContents* contents,
-                      bool mute,
-                      const std::string& cause) {
-  if (!contents || !chrome::CanToggleAudioMute(contents))
-    return;
+TabMutedResult SetTabAudioMuted(content::WebContents* contents,
+                                bool mute,
+                                const std::string& cause) {
+  DCHECK(contents);
+
+  if (!IsTabAudioMutingFeatureEnabled())
+    return TAB_MUTED_RESULT_FAIL_NOT_ENABLED;
+
+  if (!chrome::CanToggleAudioMute(contents))
+    return TAB_MUTED_RESULT_FAIL_TABCAPTURE;
 
   LastMuteMetadata::CreateForWebContents(contents);  // Create if not exists.
-  LastMuteMetadata::FromWebContents(contents)->cause = cause;
 
   contents->SetAudioMuted(mute);
+  LastMuteMetadata::FromWebContents(contents)->cause = cause;
+
+  return TAB_MUTED_RESULT_SUCCESS;
 }
 
 bool IsTabAudioMuted(content::WebContents* contents) {