Cleanup return values in chrome/common/extensions

chrome/common/extensions/api/file_browser_handlers/file_browser_handler.h

 // Copyright 2013 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_API_FILE_BROWSER_HANDLERS_FILE_BROWSER_HANDLER_H_
 #define CHROME_COMMON_EXTENSIONS_API_FILE_BROWSER_HANDLERS_FILE_BROWSER_HANDLER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 30 matching lines @@
 
   // File schema URL patterns.
   const extensions::URLPatternSet& file_url_patterns() const {
     return url_set_;
   }
   void AddPattern(const URLPattern& pattern);
   bool MatchesURL(const GURL& url) const;
   void ClearPatterns();
 
   // Action icon path.
-  const std::string icon_path() const { return default_icon_path_; }
+  const std::string& icon_path() const { return default_icon_path_; }
   void set_icon_path(const std::string& path) {
     default_icon_path_ = path;
   }
 
   // File access permissions.
   // Adjusts file_access_permission_flags_ to allow specified permission.
   bool AddFileAccessPermission(const std::string& permission_str);
   // Checks that specified file access permissions are valid (all set
   // permissions are valid and there is no other permission specified with
   // "create")
@@ skipping 30 matching lines @@
   virtual ~FileBrowserHandlerParser();
 
   virtual bool Parse(extensions::Extension* extension,
                      base::string16* error) OVERRIDE;
 
  private:
   virtual const std::vector<std::string> Keys() const OVERRIDE;
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_API_FILE_BROWSER_HANDLERS_FILE_BROWSER_HANDLER_H_