[Extensions] Fix thread-safety bug in PermissionsData

extensions/common/permissions/permissions_data.cc

Index: extensions/common/permissions/permissions_data.cc
diff --git a/extensions/common/permissions/permissions_data.cc b/extensions/common/permissions/permissions_data.cc
index fb909d03d9d6639ffe5e3e7c7431580bab4deed2..0488f0a1b17c3c0e8412120253b3a85363585850 100644
--- a/extensions/common/permissions/permissions_data.cc
+++ b/extensions/common/permissions/permissions_data.cc
@@ -320,6 +320,12 @@ bool PermissionsData::CanCaptureVisiblePage(int tab_id,
   return false;
 }
 
+PermissionsData::TabPermissionsMap
+PermissionsData::CopyTabSpecificPermissionsMap() const {
+  base::AutoLock auto_lock(runtime_lock_);
+  return tab_specific_permissions_;
+}
+
 scoped_refptr<const PermissionSet> PermissionsData::GetTabSpecificPermissions(
     int tab_id) const {
   base::AutoLock auto_lock(runtime_lock_);