Clean up a few more unused globals.

chrome/browser/extensions/api/push_messaging/push_messaging_api.cc

Index: chrome/browser/extensions/api/push_messaging/push_messaging_api.cc
diff --git a/chrome/browser/extensions/api/push_messaging/push_messaging_api.cc b/chrome/browser/extensions/api/push_messaging/push_messaging_api.cc
index 5e7e04fa79d8edbb9082cb1b04bddc0bd602afb8..cae3129492d416ae8039cf25a3fe5e427b4bd097 100644
--- a/chrome/browser/extensions/api/push_messaging/push_messaging_api.cc
+++ b/chrome/browser/extensions/api/push_messaging/push_messaging_api.cc
@@ -37,14 +37,11 @@
 
 using content::BrowserThread;
 
-namespace {
 const char kChannelIdSeparator[] = "/";
 const char kUserNotSignedIn[] = "The user is not signed in.";
 const char kUserAccessTokenFailure[] =
     "Cannot obtain access token for the user.";
-const char kTokenServiceNotAvailable[] = "Failed to get token service.";
 const int kObfuscatedGaiaIdTimeoutInDays = 30;
-}
 
 namespace extensions {