Write new Starts/EndsWith and convert FilePath functions to StringPiece.

content/browser/download/save_package.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_DOWNLOAD_SAVE_PACKAGE_H_
 #define CONTENT_BROWSER_DOWNLOAD_SAVE_PACKAGE_H_
 
 #include <queue>
 #include <set>
 #include <string>
@@ skipping 283 matching lines @@
 
   // Indicates whether user get disk error.
   bool disk_error_occurred_;
 
   // Type about saving page as only-html or complete-html.
   SavePageType save_type_;
 
   // Number of all need to be saved resources.
   size_t all_save_items_count_;
 
-  typedef std::set<base::FilePath::StringType,
-                   bool (*)(const base::FilePath::StringType&,
-                            const base::FilePath::StringType&)> FileNameSet;
+  using FileNameSet =
+      std::set<base::FilePath::StringType,
+               bool (*)(base::FilePath::StringPieceType,
+                        base::FilePath::StringPieceType)>;
   // This set is used to eliminate duplicated file names in saving directory.
   FileNameSet file_name_set_;
 
   typedef base::hash_map<base::FilePath::StringType, uint32> FileNameCountMap;
   // This map is used to track serial number for specified filename.
   FileNameCountMap file_name_count_map_;
 
   // Indicates current waiting state when SavePackage try to get something
   // from outside.
   WaitState wait_state_;
@@ skipping 13 matching lines @@
   friend class SavePackageTest;
   FRIEND_TEST_ALL_PREFIXES(SavePackageTest, TestSuggestedSaveNames);
   FRIEND_TEST_ALL_PREFIXES(SavePackageTest, TestLongSafePureFilename);
 
   DISALLOW_COPY_AND_ASSIGN(SavePackage);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_DOWNLOAD_SAVE_PACKAGE_H_