Fix bug: MIDI causes crash on onContentSettingChanged()

chrome/browser/permissions/permission_manager.cc

Index: chrome/browser/permissions/permission_manager.cc
diff --git a/chrome/browser/permissions/permission_manager.cc b/chrome/browser/permissions/permission_manager.cc
index 951966c92e750f67c3ad04e43e095a7529ae6967..e6c15eb3c0207dc19e1c5bbebfa5e0dd3781b603 100644
--- a/chrome/browser/permissions/permission_manager.cc
+++ b/chrome/browser/permissions/permission_manager.cc
@@ -398,6 +398,8 @@ void PermissionManager::OnContentSettingChanged(
   for (SubscriptionsMap::iterator iter(&subscriptions_);
        !iter.IsAtEnd(); iter.Advance()) {
     Subscription* subscription = iter.GetCurrentValue();
+    if (IsConstantPermission(subscription->permission))
+      continue;
     if (PermissionTypeToContentSetting(subscription->permission) !=
         content_type) {
       continue;