Revert of base: Remove using:: declaration from version.h header.

chrome/browser/extensions/crx_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/extensions/crx_installer.h"
 
 #include <map>
 #include <set>
 
 #include "base/bind.h"
@@ skipping 136 matching lines @@
     // Mark the extension as approved, but save the expected manifest and ID
     // so we can check that they match the CRX's.
     approved_ = true;
     expected_manifest_check_level_ = approval->manifest_check_level;
     if (expected_manifest_check_level_ !=
         WebstoreInstaller::MANIFEST_CHECK_LEVEL_NONE)
       expected_manifest_.reset(approval->manifest->DeepCopy());
     expected_id_ = approval->extension_id;
   }
   if (approval->minimum_version.get()) {
-    expected_version_.reset(new base::Version(*approval->minimum_version));
+    expected_version_.reset(new Version(*approval->minimum_version));
     expected_version_strict_checking_ = false;
   }
 
   show_dialog_callback_ = approval->show_dialog_callback;
   set_is_ephemeral(approval->is_ephemeral);
 }
 
 CrxInstaller::~CrxInstaller() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   // Ensure |client_| and |install_checker_| data members are destroyed on the
@@ skipping 308 matching lines @@
   if (!service || service->browser_terminating())
     return;
 
   // TODO(crbug.com/420147): Move this code to a utility class to avoid
   // duplication of SharedModuleService::CheckImports code.
   if (SharedModuleInfo::ImportsModules(extension())) {
     const std::vector<SharedModuleInfo::ImportInfo>& imports =
         SharedModuleInfo::GetImports(extension());
     std::vector<SharedModuleInfo::ImportInfo>::const_iterator i;
     for (i = imports.begin(); i != imports.end(); ++i) {
-      base::Version version_required(i->minimum_version);
+      Version version_required(i->minimum_version);
       const Extension* imported_module =
           service->GetExtensionById(i->extension_id, true);
       if (imported_module &&
           !SharedModuleInfo::IsSharedModule(imported_module)) {
         ReportFailureFromUIThread(CrxInstallError(
             CrxInstallError::ERROR_DECLINED,
             l10n_util::GetStringFUTF16(
                 IDS_EXTENSION_INSTALL_DEPENDENCY_NOT_SHARED_MODULE,
                 base::UTF8ToUTF16(imported_module->name()))));
         return;
@@ skipping 180 matching lines @@
   Release();  // balanced in ConfirmInstall() or ConfirmReEnable().
 
   // We're done. Since we don't post any more tasks to ourself, our ref count
   // should go to zero and we die. The destructor will clean up the temp dir.
 }
 
 void CrxInstaller::CompleteInstall() {
   DCHECK(installer_task_runner_->RunsTasksOnCurrentThread());
 
   if (!current_version_.empty()) {
-    base::Version current_version(current_version_);
+    Version current_version(current_version_);
     if (current_version.CompareTo(*(extension()->version())) > 0) {
       ReportFailureFromFileThread(CrxInstallError(
           CrxInstallError::ERROR_DECLINED,
           l10n_util::GetStringUTF16(
               extension()->is_app() ? IDS_APP_CANT_DOWNGRADE_VERSION
                                     : IDS_EXTENSION_CANT_DOWNGRADE_VERSION)));
       return;
     }
   }
 
@@ skipping 209 matching lines @@
   if (!prefs->DidExtensionEscalatePermissions(extension()->id()))
     return;
 
   if (client_) {
     AddRef();  // Balanced in InstallUIProceed() and InstallUIAbort().
     client_->ConfirmReEnable(this, extension());
   }
 }
 
 }  // namespace extensions