Makes the component installers return a Result instead of a bool.

ios/chrome/browser/net/crl_set_fetcher.h

 // Copyright 2015 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 IOS_CHROME_BROWSER_NET_CRL_SET_FETCHER_H_
 #define IOS_CHROME_BROWSER_NET_CRL_SET_FETCHER_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 22 matching lines @@
   CRLSetFetcher();
 
   void StartInitialLoad(component_updater::ComponentUpdateService* cus,
                         const base::FilePath& path);
 
   // 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;
+  Result 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
@@ skipping 17 matching lines @@
   // as the global CRL set if it's newer than the existing one.
   void SetCRLSetIfNewer(scoped_refptr<net::CRLSet> crl_set);
 
   // RegisterComponent registers this object as a component updater.
   void RegisterComponent(uint32_t sequence_of_loaded_crl);
 
   // DoDeleteFromDisk runs on the FILE thread and removes the CRLSet file from
   // the disk.
   void DoDeleteFromDisk();
 
+  bool DoInstall(const base::DictionaryValue& manifest,
+                 const base::FilePath& unpack_path);
+
   component_updater::ComponentUpdateService* cus_;
 
   // Path where the CRL file is stored.
   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  // IOS_CHROME_BROWSER_NET_CRL_SET_FETCHER_H_