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

chrome/service/cloud_print/cloud_print_auth.h

Index: chrome/service/cloud_print/cloud_print_auth.h
diff --git a/chrome/service/cloud_print/cloud_print_auth.h b/chrome/service/cloud_print/cloud_print_auth.h
index cefcbe32ccbb4d8b019c2138e55d83ca5307e137..11076949d6c3523704ec7044ec82877460cf6f26 100644
--- a/chrome/service/cloud_print/cloud_print_auth.h
+++ b/chrome/service/cloud_print/cloud_print_auth.h
@@ -12,6 +12,8 @@
 #include "google_apis/gaia/gaia_oauth_client.h"
 #include "googleurl/src/gurl.h"
 
+namespace cloud_print {
+
 // CloudPrintAuth is a class to handle login, token refresh, and other
 // authentication tasks for Cloud Print.
 // CloudPrintAuth will create new robot account for this proxy if needed.
@@ -109,5 +111,7 @@ class CloudPrintAuth
   DISALLOW_COPY_AND_ASSIGN(CloudPrintAuth);
 };
 
+}  // namespace cloud_print
+
 #endif  // CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_AUTH_H_