Add support for uninstalling components and use it in SupervisedUserWhitelistInstaller.

chrome/browser/component_updater/swiftshader_component_installer.cc

 // 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.
 
 #include "chrome/browser/component_updater/swiftshader_component_installer.h"
 
 #include <stdint.h>
 #include <string>
 #include <vector>
 
@@ skipping 91 matching lines @@
 
   // ComponentInstaller implementation:
   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:
   ~SwiftShaderComponentInstaller() override {}
 
   Version current_version_;
 };
 
 SwiftShaderComponentInstaller::SwiftShaderComponentInstaller(
     const Version& version)
     : current_version_(version) {
   DCHECK(version.IsValid());
@@ skipping 34 matching lines @@
                           base::Bind(&RegisterSwiftShaderWithChrome, path));
   return true;
 }
 
 bool SwiftShaderComponentInstaller::GetInstalledFile(
     const std::string& file,
     base::FilePath* installed_file) {
   return false;
 }
 
+bool SwiftShaderComponentInstaller::Uninstall() {
+  return false;
+}
+
 void FinishSwiftShaderUpdateRegistration(ComponentUpdateService* cus,
                                          const Version& version) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   update_client::CrxComponent swiftshader;
   swiftshader.name = "Swift Shader";
   swiftshader.installer = new SwiftShaderComponentInstaller(version);
   swiftshader.version = version;
   swiftshader.pk_hash.assign(kSha2Hash, &kSha2Hash[sizeof(kSha2Hash)]);
   if (cus->RegisterComponent(swiftshader) != ComponentUpdateService::kOk) {
@@ skipping 75 matching lines @@
 
 void RegisterSwiftShaderComponent(ComponentUpdateService* cus) {
 #if defined(ENABLE_SWIFTSHADER)
   BrowserThread::PostTask(BrowserThread::FILE,
                           FROM_HERE,
                           base::Bind(&RegisterSwiftShaderPath, cus));
 #endif
 }
 
 }  // namespace component_updater