Coverity: pass ContentSettingsPattern by const ref

chrome/browser/content_settings/content_settings_mock_observer.h

 // 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.
 
 #ifndef CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_MOCK_OBSERVER_H_
 #define CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_MOCK_OBSERVER_H_
 
 #include <string>
 
 #include "chrome/browser/content_settings/content_settings_observer.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace content_settings {
 
 class MockObserver : public Observer {
  public:
   MockObserver();
   virtual ~MockObserver();
 
   MOCK_METHOD4(OnContentSettingChanged,
-               void(ContentSettingsPattern primary_pattern,
-                    ContentSettingsPattern secondary_pattern,
+               void(const ContentSettingsPattern& primary_pattern,
+                    const ContentSettingsPattern& secondary_pattern,
                     ContentSettingsType content_type,
                     std::string resource_identifier));
  private:
   DISALLOW_COPY_AND_ASSIGN(MockObserver);
 };
 
 }  // content_settings
 
 #endif  // CHROME_BROWSER_CONTENT_SETTINGS_CONTENT_SETTINGS_MOCK_OBSERVER_H_