Split mode incognito extension can get misleading pref changed events from regular mode

chrome/browser/extensions/extension_preference_api.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/extension_preference_api.h"
 
 #include <map>
 #include <utility>
 
 #include "base/memory/singleton.h"
@@ skipping 248 matching lines @@
     OnPrefChanged(content::Source<PrefService>(source).ptr(), *pref_key);
   } else {
     NOTREACHED();
   }
 }
 
 void ExtensionPreferenceEventRouter::OnPrefChanged(
     PrefService* pref_service,
     const std::string& browser_pref) {
   bool incognito = (pref_service != profile_->GetPrefs());
-
   std::string event_name;
   ExtensionAPIPermission::ID permission = ExtensionAPIPermission::kInvalid;
   bool rv = PrefMapping::GetInstance()->FindEventForBrowserPref(
       browser_pref, &event_name, &permission);
   DCHECK(rv);
 
   ListValue args;
   DictionaryValue* dict = new DictionaryValue();
   args.Append(dict);
   const PrefService::Preference* pref =
@@ skipping 196 matching lines @@
   }
 
   std::string browser_pref;
   if (!ValidateBrowserPref(pref_key, &browser_pref))
     return false;
 
   ExtensionPrefs* prefs = profile_->GetExtensionService()->extension_prefs();
   prefs->RemoveExtensionControlledPref(extension_id(), browser_pref, scope);
   return true;
 }