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

chrome/installer/util/google_update_settings_unittest.cc

Index: chrome/installer/util/google_update_settings_unittest.cc
diff --git a/chrome/installer/util/google_update_settings_unittest.cc b/chrome/installer/util/google_update_settings_unittest.cc
index c38258c527b313b30c344d6d95b8e8e1546fa22c..314084bbfbbcaa65a2a92674b46847f5bea11a4a 100644
--- a/chrome/installer/util/google_update_settings_unittest.cc
+++ b/chrome/installer/util/google_update_settings_unittest.cc
@@ -583,7 +583,7 @@
 
   // Chrome is installed.
   machine_state.AddChrome(system_level, multi_install,
-                          new base::Version(chrome::kChromeVersion));
+      new Version(chrome::kChromeVersion));
 
   RegKey key;
   DWORD value;
@@ -1090,7 +1090,7 @@
 TEST_P(GetGoogleUpdateVersion, TestRealValue) {
   RegKey(root_key_, google_update::kRegPathGoogleUpdate, KEY_SET_VALUE)
       .WriteValue(google_update::kRegGoogleUpdateVersion, kDummyVersion);
-  base::Version expected(base::UTF16ToUTF8(kDummyVersion));
+  Version expected(base::UTF16ToUTF8(kDummyVersion));
   EXPECT_TRUE(expected.Equals(
       GoogleUpdateSettings::GetGoogleUpdateVersion(system_install_)));
   // Make sure that there's no value in the other level (user or system).