Always use a /prefetch:# switch when launching a process on Windows.

components/nacl/browser/BUILD.gn

Index: components/nacl/browser/BUILD.gn
diff --git a/components/nacl/browser/BUILD.gn b/components/nacl/browser/BUILD.gn
index 4d5228046a85ccff2677f62e2b3bf020746cc461..6336573e1cadb554ce10cffc0c9790ca84ee6453 100644
--- a/components/nacl/browser/BUILD.gn
+++ b/components/nacl/browser/BUILD.gn
@@ -63,14 +63,6 @@ source_set("browser") {
     data_deps += [ "//components/nacl/loader:helper_nonsfi" ]
   }
 
-  if (is_win) {
-    deps += [
-      # TODO(fdoray): Remove this once the PreRead field trial has expired.
-      # crbug.com/577698
-      "//components/startup_metric_utils/common",
-    ]
-  }
-
   if (is_win && current_cpu == "x86") {
     data_deps += [ "//components/nacl/broker:nacl64" ]
   }