[gn build] Port 2d30a60e9ff8
diff --git a/llvm/utils/gn/secondary/lldb/tools/lldb-dap/BUILD.gn b/llvm/utils/gn/secondary/lldb/tools/lldb-dap/BUILD.gn
index 042b0c2..96d771e 100644
--- a/llvm/utils/gn/secondary/lldb/tools/lldb-dap/BUILD.gn
+++ b/llvm/utils/gn/secondary/lldb/tools/lldb-dap/BUILD.gn
@@ -51,6 +51,7 @@
     "FunctionBreakpoint.cpp",
     "Handler/AttachRequestHandler.cpp",
     "Handler/BreakpointLocationsHandler.cpp",
+    "Handler/CancelRequestHandler.cpp",
     "Handler/CompileUnitsRequestHandler.cpp",
     "Handler/CompletionsHandler.cpp",
     "Handler/ConfigurationDoneRequestHandler.cpp",