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

chrome/browser/ui/startup/default_browser_prompt.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/ui/startup/default_browser_prompt.h"
 
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 226 matching lines @@
     } else {
       // TODO(pastarmovj): We can't really do anything meaningful here yet but
       // just prevent showing the infobar.
     }
     return;
   }
 
   const std::string disable_version_string =
       g_browser_process->local_state()->GetString(
           prefs::kBrowserSuppressDefaultBrowserPrompt);
-  const Version disable_version(disable_version_string);
+  const base::Version disable_version(disable_version_string);
   DCHECK(disable_version_string.empty() || disable_version.IsValid());
   if (disable_version.IsValid()) {
     const chrome::VersionInfo version_info;
-    if (disable_version.Equals(Version(version_info.Version())))
+    if (disable_version.Equals(base::Version(version_info.Version())))
       return;
   }
 
   content::BrowserThread::PostTask(
       content::BrowserThread::FILE, FROM_HERE,
       base::Bind(&CheckDefaultBrowserCallback, desktop_type));
 
 }
 
 #if !defined(OS_WIN)
 bool ShowFirstRunDefaultBrowserPrompt(Profile* profile) {
   return false;
 }
 #endif
 
 }  // namespace chrome