Add support for uninstalling components and use it in SupervisedUserWhitelistInstaller.

chrome/browser/component_updater/pepper_flash_component_installer.cc

 // Copyright (c) 2013 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 <stdint.h>
 #include <string.h>
 #include <vector>
 
 #include "base/base_paths.h"
 #include "base/bind.h"
@@ skipping 326 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:
   ~PepperFlashComponentInstaller() override {}
 
   Version current_version_;
 };
 
 PepperFlashComponentInstaller::PepperFlashComponentInstaller(
     const Version& version)
     : current_version_(version) {
   DCHECK(version.IsValid());
@@ skipping 31 matching lines @@
       base::Bind(&RegisterPepperFlashWithChrome, path, version, false));
   return true;
 }
 
 bool PepperFlashComponentInstaller::GetInstalledFile(
     const std::string& file,
     base::FilePath* installed_file) {
   return false;
 }
 
+bool PepperFlashComponentInstaller::Uninstall() {
+  return false;
+}
+
 bool CheckPepperFlashManifest(const base::DictionaryValue& manifest,
                               Version* version_out) {
   std::string name;
   manifest.GetStringASCII("name", &name);
   // TODO(viettrungluu): Support WinFlapper for now, while we change the format
   // of the manifest. (Should be safe to remove checks for "WinFlapper" in, say,
   // Nov. 2011.)  crbug.com/98458
   if (name != kPepperFlashManifestName && name != "WinFlapper")
     return false;
 
@@ skipping 101 matching lines @@
   base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
   if (cmd_line->HasSwitch(switches::kDisableBundledPpapiFlash))
     return;
   BrowserThread::PostTask(BrowserThread::FILE,
                           FROM_HERE,
                           base::Bind(&StartPepperFlashUpdateRegistration, cus));
 #endif
 }
 
 }  // namespace component_updater