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

chrome/browser/download/download_dir_policy_handler.cc

Index: chrome/browser/download/download_dir_policy_handler.cc
diff --git a/chrome/browser/download/download_dir_policy_handler.cc b/chrome/browser/download/download_dir_policy_handler.cc
index 8a49318b4143346a05f7f1b2dbd203f49d42d0f0..3f79ff513a4022250245425044f9ed9a89c45faa 100644
--- a/chrome/browser/download/download_dir_policy_handler.cc
+++ b/chrome/browser/download/download_dir_policy_handler.cc
@@ -37,7 +37,7 @@ void DownloadDirPolicyHandler::ApplyPolicySettings(
   if (expanded_value.empty())
     expanded_value = DownloadPrefs::GetDefaultDownloadDirectory().value();
   prefs->SetValue(prefs::kDownloadDefaultDirectory,
-                  Value::CreateStringValue(expanded_value));
+                  base::Value::CreateStringValue(expanded_value));
   prefs->SetValue(prefs::kPromptForDownload,
-                  Value::CreateBooleanValue(false));
+                  base::Value::CreateBooleanValue(false));
 }