Coverity: pass ContentSettingsPattern by const ref

chrome/browser/content_settings/content_settings_observable_provider.cc

 // Copyright (c) 2011 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/content_settings/content_settings_observable_provider.h"
 
 namespace content_settings {
 
 // ////////////////////////////////////////////////////////////////////////////
 // ObservableProvider
@@ skipping 11 matching lines @@
 
 void ObservableProvider::RemoveObserver(Observer* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
 void ObservableProvider::RemoveAllObservers() {
   observer_list_.Clear();
 }
 
 void ObservableProvider::NotifyObservers(
-    ContentSettingsPattern primary_pattern,
-    ContentSettingsPattern secondary_pattern,
+    const ContentSettingsPattern& primary_pattern,
+    const ContentSettingsPattern& secondary_pattern,
     ContentSettingsType content_type,
     std::string resource_identifier) {
   FOR_EACH_OBSERVER(Observer,
                     observer_list_,
                     OnContentSettingChanged(
                         primary_pattern,
                         secondary_pattern,
                         content_type,
                         resource_identifier));
 }
 
 }  // namespace content_settings