Add FileSystemID parameter to IsolatedContext::RegisterFileSystemForPath.

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index 164f613b0f9f19f0d94a0fee0a8e08aa643917e9..e14b364cadfabf96b07000ff83de6d6e87db5ad7 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -764,7 +764,8 @@ void RenderViewHostImpl::DragTargetDragEnter(
 
     std::string register_name;
     std::string filesystem_id = isolated_context->RegisterFileSystemForPath(
-        file_system_url.type(), file_system_url.path(), &register_name);
+        file_system_url.type(), file_system_url.filesystem_id(),
+        file_system_url.path(), &register_name);
     policy->GrantReadFileSystem(renderer_id, filesystem_id);
 
     // Note: We are using the origin URL provided by the sender here. It may be