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

chrome/installer/util/installation_validator_unittest.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 <map>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
@@ skipping 149 matching lines @@
 // and a set of modifiers.
 void FakeProductState::SetChannel(const wchar_t* base, int channel_modifiers) {
   channel_.set_value(base);
   for (size_t i = 0; i < arraysize(kChannelMethods); ++i) {
     if ((channel_modifiers & kChannelMethods[i].modifier) != 0)
       (channel_.*kChannelMethods[i].method)(true);
   }
 }
 
 void FakeProductState::SetVersion(const char* version) {
-  version_.reset(version == NULL ? NULL : new base::Version(version));
+  version_.reset(version == NULL ? NULL : new Version(version));
 }
 
 // Sets the uninstall command for this object.
 void FakeProductState::SetUninstallCommand(BrowserDistribution::Type dist_type,
                                            Level install_level,
                                            const char* version,
                                            int channel_modifiers,
                                            Vehicle vehicle) {
   DCHECK(version);
 
@@ skipping 298 matching lines @@
     AllValidInstallations,
     InstallationValidatorTest,
     Values(InstallationValidator::NO_PRODUCTS,
            InstallationValidator::CHROME_SINGLE,
            InstallationValidator::CHROME_MULTI,
            InstallationValidator::CHROME_FRAME_SINGLE,
            InstallationValidator::CHROME_FRAME_SINGLE_CHROME_SINGLE,
            InstallationValidator::CHROME_FRAME_SINGLE_CHROME_MULTI,
            InstallationValidator::CHROME_FRAME_MULTI,
            InstallationValidator::CHROME_FRAME_MULTI_CHROME_MULTI));