Use a valid /prefetch argument when launching a process.

chrome/service/BUILD.gn

Index: chrome/service/BUILD.gn
diff --git a/chrome/service/BUILD.gn b/chrome/service/BUILD.gn
index bb741209260f2697d2492c9b99f3bca18e2ab9c7..a1ef809e4134289be7ce9fd1d8c85449ae5ca967 100644
--- a/chrome/service/BUILD.gn
+++ b/chrome/service/BUILD.gn
@@ -71,6 +71,11 @@ static_library("service") {
       "service_utility_process_host.cc",
       "service_utility_process_host.h",
     ]
+    deps += [
+      # TODO(fdoray): Remove this once the PreRead field trial has expired.
+      # crbug.com/577698
+      "//components/startup_metric_utils/common",
+    ]
   } else {
     sources += [ "cloud_print/print_system_dummy.cc" ]
   }