Add base:: to fix the build

chrome/browser/enumerate_modules_model_win.cc

 // Copyright (c) 2011 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/enumerate_modules_model_win.h"
 
 #include <Tlhelp32.h>
 #include <wintrust.h>
 
 #include "app/l10n_util.h"
@@ skipping 799 matching lines @@
       limited_mode_(false),
       confirmed_bad_modules_detected_(0),
       suspected_bad_modules_detected_(0) {
   const CommandLine& cmd_line = *CommandLine::ForCurrentProcess();
   if (cmd_line.HasSwitch(switches::kConflictingModulesCheck)) {
     check_modules_timer_.Start(
         base::TimeDelta::FromMilliseconds(kModuleCheckDelayMs),
         this, &EnumerateModulesModel::ScanNow);
   }
 
-  lock = new Lock();
+  lock = new base::Lock();
 }
 
 EnumerateModulesModel::~EnumerateModulesModel() {
   delete lock;
 }
 
 void EnumerateModulesModel::DoneScanning() {
   confirmed_bad_modules_detected_ = 0;
   suspected_bad_modules_detected_ = 0;
   for (ModuleEnumerator::ModulesVector::const_iterator module =
@@ skipping 48 matching lines @@
   GenerateHash(WideToUTF8(module.name), &filename);
   GenerateHash(WideToUTF8(module.location), &location);
   GenerateHash(WideToUTF8(module.description), &description);
   GenerateHash(WideToUTF8(module.digital_signer), &signer);
 
   string16 url = l10n_util::GetStringFUTF16(IDS_HELP_CENTER_VIEW_CONFLICTS,
       ASCIIToUTF16(filename), ASCIIToUTF16(location),
       ASCIIToUTF16(description), ASCIIToUTF16(signer));
   return GURL(UTF16ToUTF8(url));
 }