Implement two new policies to control muting the audio I/O.

chrome/browser/policy/configuration_policy_handler_list.cc

Index: chrome/browser/policy/configuration_policy_handler_list.cc
diff --git a/chrome/browser/policy/configuration_policy_handler_list.cc b/chrome/browser/policy/configuration_policy_handler_list.cc
index 742466d9ab7e66f01502a63d5f8aaffb07166b34..7c42a48954f3f701ae1edfecde3417cc43bbfd2f 100644
--- a/chrome/browser/policy/configuration_policy_handler_list.cc
+++ b/chrome/browser/policy/configuration_policy_handler_list.cc
@@ -320,6 +320,12 @@ const PolicyToPreferenceMapEntry kSimplePolicyMap[] = {
   { key::kExternalStorageDisabled,
     prefs::kExternalStorageDisabled,
     Value::TYPE_BOOLEAN },
+  { key::kAudioOutputDisabled,
+    prefs::kAudioOutputDisabled,

[Mattias Nissler (ping if slow), 2012/08/28 12:24:24]

If you change the policy to positive polarity, you'll likely want to change the
prefs as well.

[pastarmovj, 2012/08/28 15:11:50]

Done.

+    Value::TYPE_BOOLEAN },
+  { key::kAudioCaptureDisabled,
+    prefs::kAudioCaptureDisabled,
+    Value::TYPE_BOOLEAN },
 #endif  // defined(OS_CHROMEOS)
 
 #if !defined(OS_MACOSX) && !defined(OS_CHROMEOS)