Update URLPatternSet to contain a std::set instead of std::vector.

chrome/common/extensions/extension.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_COMMON_EXTENSIONS_EXTENSION_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 526 matching lines @@
   // We keep a cache of images loaded from extension resources based on their
   // path and a string representation of a size that may have been used to
   // scale it (or the empty string if the image is at its original size).
   typedef std::pair<FilePath, std::string> ImageCacheKey;
   typedef std::map<ImageCacheKey, SkBitmap> ImageCache;
 
   // Normalize the path for use by the extension. On Windows, this will make
   // sure the drive letter is uppercase.
   static FilePath MaybeNormalizePath(const FilePath& path);
 
-  // Returns the distinct hosts that can be displayed in the install UI or be
-  // used for privilege comparisons. This discards some of the detail that is
-  // present in the manifest to make it as easy as possible to process by users.
-  // In particular we disregard the scheme and path components of URLPatterns
-  // and de-dupe the result, which includes filtering out common hosts with
-  // differing RCDs. If |include_rcd| is true, then the de-duped result
-  // will be the first full entry, including its RCD. So if the list was
-  // "*.google.co.uk" and "*.google.com", the returned value would just be
-  // "*.google.co.uk". Keeping the RCD in the result is useful for display
-  // purposes when you want to show the user one sample hostname from the list.
-  // If you need to compare two URLPatternLists for security equality, then set
-  // |include_rcd| to false, which will return a result like "*.google.",
-  // regardless of the order of the patterns.
-  static std::vector<std::string> GetDistinctHosts(
-      const URLPatternList& host_patterns, bool include_rcd);
-
   // Returns true if this extension id is from a trusted provider.
   static bool IsTrustedId(const std::string& id);
 
   Extension(const FilePath& path, Location location);
   ~Extension();
 
   // Initialize the extension from a parsed manifest.
   bool InitFromValue(const base::DictionaryValue& value, int flags,
                      std::string* error);
 
@@ skipping 289 matching lines @@
   // Was the extension already disabled?
   bool already_disabled;
 
   // The extension being unloaded - this should always be non-NULL.
   const Extension* extension;
 
   UnloadedExtensionInfo(const Extension* extension, Reason reason);
 };
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_H_