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

chrome/browser/importer/external_process_importer_client.cc

Index: chrome/browser/importer/external_process_importer_client.cc
diff --git a/chrome/browser/importer/external_process_importer_client.cc b/chrome/browser/importer/external_process_importer_client.cc
index 64d7c47dd5a2e921e1aa05df261fec369fba737b..d9e781a776edbdc348232b117b2e9a1baf052b5a 100644
--- a/chrome/browser/importer/external_process_importer_client.cc
+++ b/chrome/browser/importer/external_process_importer_client.cc
@@ -297,7 +297,7 @@ void ExternalProcessImporterClient::StartProcessOnIOThread(
 
   // Dictionary of all localized strings that could be needed by the importer
   // in the external process.
-  DictionaryValue localized_strings;
+  base::DictionaryValue localized_strings;
   localized_strings.SetString(
       base::IntToString(IDS_BOOKMARK_GROUP),
       l10n_util::GetStringUTF8(IDS_BOOKMARK_GROUP));