Cleanup: remove global volume preferences

settings.audio.volume_percent is no longer being used.

This CL removes all references to it.

Bug: b:307217147
Test: CQ
Change-Id: I71f04f181498d4b114cbf84c4a8a2bac00a232a3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4983110
Commit-Queue: Jeremy Wu <[email protected]>
Reviewed-by: Tommy Nyquist <[email protected]>
Reviewed-by: Mitsuru Oshima <[email protected]>
Reviewed-by: Li-Yu Yu <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1217361}
diff --git a/chrome/browser/prefs/browser_prefs.cc b/chrome/browser/prefs/browser_prefs.cc
index b423ca4..1e7a865 100644
--- a/chrome/browser/prefs/browser_prefs.cc
+++ b/chrome/browser/prefs/browser_prefs.cc
@@ -936,6 +936,7 @@
 #if BUILDFLAG(IS_CHROMEOS_ASH)
 const char kLastSuccessfulDomainPref[] = "android_sms.last_successful_domain";
 const char kShouldAttemptReenable[] = "android_sms.should_attempt_reenable";
+const char kAudioVolumePercent[] = "settings.audio.volume_percent";
 #endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
 // Deprecated 10/2023.
@@ -1327,6 +1328,7 @@
 #if BUILDFLAG(IS_CHROMEOS_ASH)
   registry->RegisterStringPref(kLastSuccessfulDomainPref, std::string());
   registry->RegisterBooleanPref(kShouldAttemptReenable, true);
+  registry->RegisterDoublePref(kAudioVolumePercent, 0);
 #endif  // BUILDFLAG(IS_CHROMEOS_ASH)
   registry->RegisterTimePref(kDownloadLastCompleteTime, base::Time());
 
@@ -2508,6 +2510,7 @@
 #if BUILDFLAG(IS_CHROMEOS_ASH)
   profile_prefs->ClearPref(kLastSuccessfulDomainPref);
   profile_prefs->ClearPref(kShouldAttemptReenable);
+  profile_prefs->ClearPref(kAudioVolumePercent);
 #endif  // BUILDFLAG(IS_CHROMEOS_ASH)
 
   // Added 10/2023.