Cleanup: Remove unneeded forward declarations in chrome/browser/sync.

chrome/browser/sync/internal_api/change_record.h

Index: chrome/browser/sync/internal_api/change_record.h
===================================================================
--- chrome/browser/sync/internal_api/change_record.h	(revision 110049)
+++ chrome/browser/sync/internal_api/change_record.h	(working copy)
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_SYNC_INTERNAL_API_CHANGE_RECORD_H_
 #define CHROME_BROWSER_SYNC_INTERNAL_API_CHANGE_RECORD_H_
 
+#include <vector>
+
 #include "base/basictypes.h"
 #include "base/memory/linked_ptr.h"
 #include "chrome/browser/sync/protocol/password_specifics.pb.h"
@@ -17,8 +19,6 @@
 
 namespace sync_api {
 
-class BaseTransaction;
-
 // TODO(zea): One day get passwords playing nicely with the rest of encryption
 // and get rid of this.
 class ExtraPasswordChangeRecordData {
@@ -62,6 +62,6 @@
 
 typedef browser_sync::Immutable<ChangeRecordList> ImmutableChangeRecordList;
 
-} // namespace sync_api
+}  // namespace sync_api
 
 #endif  // CHROME_BROWSER_SYNC_INTERNAL_API_CHANGE_RECORD_H_