Use a valid /prefetch argument when launching a process.

content/browser/utility_process_host_impl.cc

Index: content/browser/utility_process_host_impl.cc
diff --git a/content/browser/utility_process_host_impl.cc b/content/browser/utility_process_host_impl.cc
index f51ec29f76ab7cd368b79423aa735f3044f72e58..99cc64f68438f6132589c88653043328cbdd71d1 100644
--- a/content/browser/utility_process_host_impl.cc
+++ b/content/browser/utility_process_host_impl.cc
@@ -312,6 +312,11 @@ bool UtilityProcessHostImpl::StartProcess() {
     std::string locale = GetContentClient()->browser()->GetApplicationLocale();
     cmd_line->AppendSwitchASCII(switches::kLang, locale);
 
+#if defined(OS_WIN)
+    if (GetContentClient()->browser()->ShouldUseWindowsPrefetchArgument())
+      cmd_line->AppendArg(switches::kPrefetchArgumentOther);
+#endif  // defined(OS_WIN)
+
     if (no_sandbox_)
       cmd_line->AppendSwitch(switches::kNoSandbox);