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

chrome/installer/setup/install_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 <objbase.h>
 
 #include <string>
 
 #include "base/base_paths.h"
 #include "base/files/file_path.h"
@@ skipping 20 matching lines @@
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace {
 
 class CreateVisualElementsManifestTest : public testing::Test {
  protected:
   void SetUp() override {
     // Create a temp directory for testing.
     ASSERT_TRUE(test_dir_.CreateUniqueTempDir());
 
-    version_ = base::Version("0.0.0.0");
+    version_ = Version("0.0.0.0");
 
     version_dir_ = test_dir_.path().AppendASCII(version_.GetString());
     ASSERT_TRUE(base::CreateDirectory(version_dir_));
 
     manifest_path_ =
         test_dir_.path().Append(installer::kVisualElementsManifest);
   }
 
   void TearDown() override {
     // Clean up test directory manually so we can fail if it leaks.
     ASSERT_TRUE(test_dir_.Delete());
   }
 
   // The temporary directory used to contain the test operations.
   base::ScopedTempDir test_dir_;
 
   // A dummy version number used to create the version directory.
-  base::Version version_;
+  Version version_;
 
   // The path to |test_dir_|\|version_|.
   base::FilePath version_dir_;
 
   // The path to VisualElementsManifest.xml.
   base::FilePath manifest_path_;
 };
 
 class InstallShortcutTest : public testing::Test {
  protected:
@@ skipping 370 matching lines @@
   installer::EscapeXmlAttributeValueInSingleQuotes(&val);
   ASSERT_STREQ(kExpectedEscapedVal, val.c_str());
 }
 
 TEST(EscapeXmlAttributeValueTest, DontEscapeNormalValue) {
   base::string16 val(L"Google Chrome");
   static const wchar_t kExpectedEscapedVal[] = L"Google Chrome";
   installer::EscapeXmlAttributeValueInSingleQuotes(&val);
   ASSERT_STREQ(kExpectedEscapedVal, val.c_str());
 }