Don't use //base:system_malloc for spend_cpu_time testing tool.

RELNOTES: None.
PiperOrigin-RevId: 177342763
diff --git a/src/test/shell/integration/BUILD b/src/test/shell/integration/BUILD
index 1d9b55d..271f584 100644
--- a/src/test/shell/integration/BUILD
+++ b/src/test/shell/integration/BUILD
@@ -299,7 +299,6 @@
     name = "spend_cpu_time",
     testonly = 1,
     srcs = ["spend_cpu_time.cc"],
-    malloc = "//base:system_malloc",
 )
 
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