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

extensions/common/manifest_handlers/shared_module_info.cc

 // Copyright 2013 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 "extensions/common/manifest_handlers/shared_module_info.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
@@ skipping 165 matching lines @@
       }
       imports_.back().extension_id = extension_id;
       if (import_entry->HasKey(keys::kMinimumVersion)) {
         std::string min_version;
         if (!import_entry->GetString(keys::kMinimumVersion, &min_version)) {
           *error = ErrorUtils::FormatErrorMessageUTF16(
               errors::kInvalidImportVersion, base::IntToString(i));
           return false;
         }
         imports_.back().minimum_version = min_version;
-        base::Version v(min_version);
+        Version v(min_version);
         if (!v.IsValid()) {
           *error = ErrorUtils::FormatErrorMessageUTF16(
               errors::kInvalidImportVersion, base::IntToString(i));
           return false;
         }
       }
     }
   }
   return true;
 }
@@ skipping 30 matching lines @@
 
 const std::vector<std::string> SharedModuleHandler::Keys() const {
   static const char* keys[] = {
     keys::kExport,
     keys::kImport
   };
   return std::vector<std::string>(keys, keys + arraysize(keys));
 }
 
 }  // namespace extensions