Rename "register" -> "subscribe" in the Push Messaging code.

content/child/push_messaging/push_provider.h

Index: content/child/push_messaging/push_provider.h
diff --git a/content/child/push_messaging/push_provider.h b/content/child/push_messaging/push_provider.h
index e44bf41b943af62b3abe8150e8a7eadee1535252..eec02a64d8f0e594c98d7c889a8406aa80566104 100644
--- a/content/child/push_messaging/push_provider.h
+++ b/content/child/push_messaging/push_provider.h
@@ -63,18 +63,19 @@ class PushProvider : public blink::WebPushProvider,
                PushDispatcher* push_dispatcher);
 
   // IPC message handlers.
-  void OnRegisterFromWorkerSuccess(int request_id,
-                                   const GURL& endpoint,
-                                   const std::string& registration_id);
-  void OnRegisterFromWorkerError(int request_id, PushRegistrationStatus status);
-  void OnUnregisterSuccess(int request_id, bool did_unregister);
-  void OnUnregisterError(int request_id,
-                         blink::WebPushError::ErrorType error_type,
-                         const std::string& error_message);
-  void OnGetRegistrationSuccess(int request_id,
+  void OnSubscribeFromWorkerSuccess(int request_id,
+                                    const GURL& endpoint,
+                                    const std::string& subscription_id);
+  void OnSubscribeFromWorkerError(int request_id,
+                                  PushSubscriptionStatus status);
+  void OnUnsubscribeSuccess(int request_id, bool did_unsubscribe);
+  void OnUnsubscribeError(int request_id,
+                          blink::WebPushError::ErrorType error_type,
+                          const std::string& error_message);
+  void OnGetSubscriptionSuccess(int request_id,
                                 const GURL& endpoint,
-                                const std::string& registration_id);
-  void OnGetRegistrationError(int request_id, PushGetRegistrationStatus status);
+                                const std::string& subscription_id);
+  void OnGetSubscriptionError(int request_id, PushGetSubscriptionStatus status);
   void OnGetPermissionStatusSuccess(int request_id,
                                     blink::WebPushPermissionStatus status);
   void OnGetPermissionStatusError(int request_id);