components: Cleanup class/struct fwd declarations

components/drive/chromeos/change_list_loader.h

Index: components/drive/chromeos/change_list_loader.h
diff --git a/components/drive/chromeos/change_list_loader.h b/components/drive/chromeos/change_list_loader.h
index 514cb3a3c4a8fefe31cf4b8e30001146ae193c26..f3abf81d70de8a6b96cc3f5c5ca0a32a1f0d7b04 100644
--- a/components/drive/chromeos/change_list_loader.h
+++ b/components/drive/chromeos/change_list_loader.h
@@ -21,8 +21,6 @@
 #include "google_apis/drive/drive_api_error_codes.h"
 #include "google_apis/drive/drive_common_callbacks.h"
 
-class GURL;
-
 namespace base {
 class CancellationFlag;
 class ScopedClosureRunner;
@@ -38,14 +36,12 @@ namespace drive {
 
 class EventLogger;
 class JobScheduler;
-class ResourceEntry;
 
 namespace internal {
 
 class ChangeList;
 class ChangeListLoaderObserver;
 class ChangeListProcessor;
-class DirectoryLoader;
 class ResourceMetadata;
 
 // Delays execution of tasks as long as more than one lock is alive.