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

components/variations/processed_study.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 "components/variations/processed_study.h"
 
 #include <set>
 #include <string>
 
 #include "base/version.h"
 #include "components/variations/proto/study.pb.h"
 
 namespace variations {
 
 namespace {
 
 // Validates the sanity of |study| and computes the total probability and
 // whether all assignments are to a single group.
 bool ValidateStudyAndComputeTotalProbability(
     const Study& study,
     base::FieldTrial::Probability* total_probability,
     bool* all_assignments_to_one_group) {
   // At the moment, a missing default_experiment_name makes the study invalid.
   if (study.default_experiment_name().empty()) {
     DVLOG(1) << study.name() << " has no default experiment defined.";
     return false;
   }
   if (study.filter().has_min_version() &&
-      !base::Version::IsValidWildcardString(study.filter().min_version())) {
+      !Version::IsValidWildcardString(study.filter().min_version())) {
     DVLOG(1) << study.name() << " has invalid min version: "
              << study.filter().min_version();
     return false;
   }
   if (study.filter().has_max_version() &&
-      !base::Version::IsValidWildcardString(study.filter().max_version())) {
+      !Version::IsValidWildcardString(study.filter().max_version())) {
     DVLOG(1) << study.name() << " has invalid max version: "
              << study.filter().max_version();
     return false;
   }
 
   const std::string& default_group_name = study.default_experiment_name();
   base::FieldTrial::Probability divisor = 0;
 
   bool multiple_assigned_groups = false;
   bool found_default_group = false;
@@ skipping 77 matching lines @@
     std::vector<ProcessedStudy>* processed_studies) {
   ProcessedStudy processed_study;
   if (processed_study.Init(study, is_expired)) {
     processed_studies->push_back(processed_study);
     return true;
   }
   return false;
 }
 
 }  // namespace variations