Do not typedef ExtensionId/ID, since it's already available in extension_id.h

chrome/browser/extensions/api/messaging/message_service.h

Index: chrome/browser/extensions/api/messaging/message_service.h
diff --git a/chrome/browser/extensions/api/messaging/message_service.h b/chrome/browser/extensions/api/messaging/message_service.h
index 2c6b52d0b2482cf6c6c1ac675bb4c45bcf0c1863..667594eb6cfcaeec2106b9880d4b76f5e65f30b8 100644
--- a/chrome/browser/extensions/api/messaging/message_service.h
+++ b/chrome/browser/extensions/api/messaging/message_service.h
@@ -19,6 +19,7 @@
 #include "extensions/browser/api/messaging/native_message_host.h"
 #include "extensions/browser/browser_context_keyed_api_factory.h"
 #include "extensions/common/api/messaging/message.h"
+#include "extensions/common/extension_id.h"
 
 class GURL;
 class Profile;
@@ -195,9 +196,8 @@ class MessageService : public BrowserContextKeyedAPI {
 
   // A map of channel ID to information about the extension that is waiting
   // for that channel to open. Used for lazy background pages.
-  using ExtensionID = std::string;
   using PendingLazyBackgroundPageChannel =
-      std::pair<content::BrowserContext*, ExtensionID>;
+      std::pair<content::BrowserContext*, ExtensionId>;
   using PendingLazyBackgroundPageChannelMap =
       std::map<int, PendingLazyBackgroundPageChannel>;