Move common cloud print methods from service/cloud_print to common/cloud_print.

chrome/service/cloud_print/cloud_print_proxy_backend.cc

Index: chrome/service/cloud_print/cloud_print_proxy_backend.cc
diff --git a/chrome/service/cloud_print/cloud_print_proxy_backend.cc b/chrome/service/cloud_print/cloud_print_proxy_backend.cc
index 44df7b60d6adbcfadfe0461ca6a3e5b5a748a6fe..003a43b6730000db23fc3e944cfeb6737f9ed83a 100644
--- a/chrome/service/cloud_print/cloud_print_proxy_backend.cc
+++ b/chrome/service/cloud_print/cloud_print_proxy_backend.cc
@@ -14,9 +14,9 @@
 #include "base/rand_util.h"
 #include "base/values.h"
 #include "chrome/common/chrome_switches.h"
+#include "chrome/common/cloud_print/cloud_print_constants.h"
 #include "chrome/service/cloud_print/cloud_print_auth.h"
 #include "chrome/service/cloud_print/cloud_print_connector.h"
-#include "chrome/service/cloud_print/cloud_print_consts.h"
 #include "chrome/service/cloud_print/cloud_print_helpers.h"
 #include "chrome/service/cloud_print/cloud_print_token_store.h"
 #include "chrome/service/cloud_print/connector_settings.h"
@@ -32,6 +32,8 @@
 #include "jingle/notifier/listener/push_client_observer.h"
 #include "ui/base/l10n/l10n_util.h"
 
+namespace cloud_print {
+
 // The real guts of CloudPrintProxyBackend, to keep the public client API clean.
 class CloudPrintProxyBackend::Core
     : public base::RefCountedThreadSafe<CloudPrintProxyBackend::Core>,
@@ -576,3 +578,4 @@ void CloudPrintProxyBackend::Core::OnPingResponse() {
   VLOG(1) << "CP_CONNECTOR: Ping response received.";
 }
 
+}  // namespace cloud_print