Add support for uninstalling components and use it in SupervisedUserWhitelistInstaller.

chrome/browser/supervised_user/supervised_user_whitelist_service_unittest.cc

 // Copyright 2014 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 <map>
 #include <set>
 #include <string>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 38 matching lines @@
   // SupervisedUserWhitelistInstaller implementation:
   void RegisterWhitelist(const std::string& crx_id,
                          const std::string& name,
                          bool new_installation,
                          const WhitelistReadyCallback& callback) override {
     ASSERT_FALSE(WhitelistIsRegistered(crx_id)) << crx_id;
     registered_whitelists_.insert(crx_id);
     ready_callbacks_[crx_id] = callback;
   }
 
-  void UnregisterWhitelist(const std::string& crx_id) override {
+  void UninstallWhitelist(const std::string& crx_id) override {
     EXPECT_TRUE(WhitelistIsRegistered(crx_id)) << crx_id;
     registered_whitelists_.erase(crx_id);
-    // Don't remove the callback (see above).
+    // Don't remove the ready callback (see above).
   }
 
  private:
   bool WhitelistIsRegistered(const std::string& crx_id) {
     return registered_whitelists_.count(crx_id) > 0;
   }
 
   std::set<std::string> registered_whitelists_;
   std::map<std::string, WhitelistReadyCallback> ready_callbacks_;
 };
@@ skipping 191 matching lines @@
       service_->GetAllSyncData(syncer::SUPERVISED_USER_WHITELISTS);
   ASSERT_EQ(2u, sync_data.size());
   const sync_pb::ManagedUserWhitelistSpecifics* whitelist =
       FindWhitelist(sync_data, "aaaa");
   ASSERT_TRUE(whitelist);
   EXPECT_EQ("Whitelist A", whitelist->name());
   whitelist = FindWhitelist(sync_data, "bbbb");
   ASSERT_TRUE(whitelist);
   EXPECT_EQ("Whitelist B", whitelist->name());
 }