Use a valid /prefetch argument when launching a process.

chrome/common/BUILD.gn

Index: chrome/common/BUILD.gn
diff --git a/chrome/common/BUILD.gn b/chrome/common/BUILD.gn
index fb57a95024b141113c10314e226137e0a360fbcd..015ede66b7048e3543ed9d8324aa98da41ed02d4 100644
--- a/chrome/common/BUILD.gn
+++ b/chrome/common/BUILD.gn
@@ -211,6 +211,14 @@ static_library("common") {
       sources += rebase_path(gypi_values.chrome_common_service_process_sources,
                              ".",
                              "//chrome")
+
+      if (is_win) {
+        deps = [
+          # TODO(fdoray): Remove this once the PreRead field trial has expired.
+          # crbug.com/577698
+          "//components/startup_metric_utils/common",
+        ]
+      }
     }
   }