Clean up a few more unused globals.

chrome/browser/printing/print_system_task_proxy.cc

Index: chrome/browser/printing/print_system_task_proxy.cc
diff --git a/chrome/browser/printing/print_system_task_proxy.cc b/chrome/browser/printing/print_system_task_proxy.cc
index 2b8ad4ef28a921b55c5d34492d64cc0c26962162..74819f723a7d8f47c10d87976456190bd063ad5a 100644
--- a/chrome/browser/printing/print_system_task_proxy.cc
+++ b/chrome/browser/printing/print_system_task_proxy.cc
@@ -24,17 +24,11 @@
 
 using content::BrowserThread;
 
-namespace {
-
 const char kPrinterId[] = "printerId";
 const char kDisableColorOption[] = "disableColorOption";
 const char kSetDuplexAsDefault[] = "setDuplexAsDefault";
-const char kPrinterColorModelForBlack[] = "printerColorModelForBlack";
-const char kPrinterColorModelForColor[] = "printerColorModelForColor";
 const char kPrinterDefaultDuplexValue[] = "printerDefaultDuplexValue";
 
-}  // namespace
-
 PrintSystemTaskProxy::PrintSystemTaskProxy(
     const base::WeakPtr<PrintPreviewHandler>& handler,
     printing::PrintBackend* print_backend,