[GCM] API update to allow only a single sender in registration

chrome/browser/services/gcm/fake_gcm_profile_service.cc

Index: chrome/browser/services/gcm/fake_gcm_profile_service.cc
diff --git a/chrome/browser/services/gcm/fake_gcm_profile_service.cc b/chrome/browser/services/gcm/fake_gcm_profile_service.cc
index c124f4f5ad21e72b98bc82813955a18625f9d55b..66748a8381a34f4c8518616ef527e1b319c79e6a 100644
--- a/chrome/browser/services/gcm/fake_gcm_profile_service.cc
+++ b/chrome/browser/services/gcm/fake_gcm_profile_service.cc
@@ -26,7 +26,7 @@ FakeGCMProfileService::FakeGCMProfileService(Profile* profile)
 FakeGCMProfileService::~FakeGCMProfileService() {}
 
 void FakeGCMProfileService::Register(const std::string& app_id,
-                                     const std::vector<std::string>& sender_ids,
+                                     const std::string& sender_id,
                                      const std::string& cert,
                                      RegisterCallback callback) {
   base::MessageLoop::current()->PostTask(
@@ -34,23 +34,23 @@ void FakeGCMProfileService::Register(const std::string& app_id,
       base::Bind(&FakeGCMProfileService::RegisterFinished,
                  base::Unretained(this),
                  app_id,
-                 sender_ids,
+                 sender_id,
                  cert,
                  callback));
 }
 
 void FakeGCMProfileService::RegisterFinished(
     const std::string& app_id,
-    const std::vector<std::string>& sender_ids,
+    const std::string& sender_id,
     const std::string& cert,
     RegisterCallback callback) {
   if (collect_) {
     last_registered_app_id_ = app_id;
-    last_registered_sender_ids_ = sender_ids;
+    last_registered_sender_id_ = sender_id;
     last_registered_cert_ = cert;
   }
 
-  callback.Run(base::UintToString(sender_ids.size()), GCMClient::SUCCESS);
+  callback.Run(base::UintToString(sender_id.size()), GCMClient::SUCCESS);
 }
 
 void FakeGCMProfileService::Send(const std::string& app_id,