Add support for uninstalling components and use it in SupervisedUserWhitelistInstaller.

chrome/browser/net/crl_set_fetcher.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 CHROME_BROWSER_NET_CRL_SET_FETCHER_H_
 #define CHROME_BROWSER_NET_CRL_SET_FETCHER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 23 matching lines @@
 
   // DeleteFromDisk asynchronously delete the CRLSet file.
   void DeleteFromDisk(const base::FilePath& path);
 
   // ComponentInstaller interface
   void OnUpdateError(int error) override;
   bool Install(const base::DictionaryValue& manifest,
                const base::FilePath& unpack_path) override;
   bool GetInstalledFile(const std::string& file,
                         base::FilePath* installed_file) override;
+  bool Uninstall() override;
 
  private:
   friend class base::RefCountedThreadSafe<CRLSetFetcher>;
 
   ~CRLSetFetcher() override;
 
   // GetCRLSetbase::FilePath gets the path of the CRL set file in the user data
   // dir.
   base::FilePath GetCRLSetFilePath() const;
 
@@ skipping 27 matching lines @@
   base::FilePath crl_path_;
 
   // We keep a pointer to the current CRLSet for use on the FILE thread when
   // applying delta updates.
   scoped_refptr<net::CRLSet> crl_set_;
 
   DISALLOW_COPY_AND_ASSIGN(CRLSetFetcher);
 };
 
 #endif  // CHROME_BROWSER_NET_CRL_SET_FETCHER_H_