[Extensions] Code cleanup - const &s

chrome/common/extensions/manifest_handlers/automation.h

 // Copyright 2014 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_COMMON_EXTENSIONS_MANIFEST_HANDLERS_AUTOMATION_H_
 #define CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_AUTOMATION_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 41 matching lines @@
   // Returns the list of hosts that this extension can request an automation
   // tree from.
   const URLPatternSet matches;
 
   // Whether the extension is allowed interactive access (true) or read-only
   // access (false) to the automation tree.
   const bool interact;
 
  private:
   AutomationInfo();
-  AutomationInfo(bool desktop, URLPatternSet matches, bool interact);
+  AutomationInfo(bool desktop, const URLPatternSet& matches, bool interact);
 
   static std::unique_ptr<api::manifest_types::Automation> AsManifestType(
       const AutomationInfo& info);
 
   DISALLOW_COPY_AND_ASSIGN(AutomationInfo);
   friend class AutomationManifestPermission;
   friend class AutomationHandler;
 };
 
 // Parses the automation manifest entry.
@@ skipping 10 matching lines @@
   ManifestPermission* CreateInitialRequiredPermission(
       const Extension* extension) override;
   const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(AutomationHandler);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_MANIFEST_HANDLERS_AUTOMATION_H_