Remove dependency of chrome in GuestViewBase.

extensions/browser/api/extensions_api_client.h

Index: extensions/browser/api/extensions_api_client.h
diff --git a/extensions/browser/api/extensions_api_client.h b/extensions/browser/api/extensions_api_client.h
index dc45299b49b323ae3250c7c05bbb0b45fd370689..a13b8fe32adadaa55d197a9f22975664a7b6a523 100644
--- a/extensions/browser/api/extensions_api_client.h
+++ b/extensions/browser/api/extensions_api_client.h
@@ -71,6 +71,8 @@ class ExtensionsAPIClient {
   // Returns the HidService instance for this embedder.
   virtual device::HidService* GetHidService();
 
+  virtual void RegisterGuestViewTypes() {}
+
   // NOTE: If this interface gains too many methods (perhaps more than 20) it
   // should be split into one interface per API.
 };