Update some uses of Value in chrome/browser to use the base:: namespace.

chrome/browser/policy/policy_prefs_browsertest.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 <algorithm>
 #include <cstdlib>
 #include <map>
 #include <sstream>
 #include <string>
 #include <vector>
@@ skipping 450 matching lines @@
   }
 
   void ClearProviderPolicy() {
     provider_.UpdateChromePolicy(PolicyMap());
     base::RunLoop().RunUntilIdle();
   }
 
   void SetProviderPolicy(const base::DictionaryValue& policies,
                          PolicyLevel level) {
     PolicyMap policy_map;
-    for (DictionaryValue::Iterator it(policies); !it.IsAtEnd(); it.Advance()) {
+    for (base::DictionaryValue::Iterator it(policies);
+         !it.IsAtEnd(); it.Advance()) {
       const PolicyDetails* policy_details = GetChromePolicyDetails(it.key());
       ASSERT_TRUE(policy_details);
       policy_map.Set(
           it.key(),
           level,
           POLICY_SCOPE_USER,
           it.value().DeepCopy(),
           policy_details->max_external_data_size ?
               new ExternalDataFetcher(base::WeakPtr<ExternalDataManager>(),
                                       it.key()) :
@@ skipping 181 matching lines @@
       }
     }
   }
 }
 
 INSTANTIATE_TEST_CASE_P(PolicyPrefIndicatorTestInstance,
                         PolicyPrefIndicatorTest,
                         testing::ValuesIn(SplitPoliciesIntoChunks(50)));
 
 }  // namespace policy