Update all users of base::Version to explicitly specify the namespace, and clean up the header.

chrome/browser/first_run/upgrade_util_win.cc

Index: chrome/browser/first_run/upgrade_util_win.cc
diff --git a/chrome/browser/first_run/upgrade_util_win.cc b/chrome/browser/first_run/upgrade_util_win.cc
index 47d74653518ee033bce5d7cab2b5e798028d7a7d..3c430fd91c888cb51f66c2fb22b7289f744453c1 100644
--- a/chrome/browser/first_run/upgrade_util_win.cc
+++ b/chrome/browser/first_run/upgrade_util_win.cc
@@ -235,12 +235,12 @@ bool SwapNewChromeExeIfPresent() {
     if (cmd_line.HasSwitch(switches::kChromeVersion)) {
       std::string version_string =
           cmd_line.GetSwitchValueASCII(switches::kChromeVersion);
-      Version cmd_version(version_string);
+      base::Version cmd_version(version_string);
 
       std::wstring pv_value;
       if (key.ReadValue(google_update::kRegVersionField,
                         &pv_value) == ERROR_SUCCESS) {
-        Version pv_version(WideToASCII(pv_value));
+        base::Version pv_version(WideToASCII(pv_value));
         if (cmd_version.IsValid() && pv_version.IsValid() &&
             !cmd_version.Equals(pv_version)) {
           return false;