Use a valid /prefetch argument when launching a process.

content/public/browser/content_browser_client.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/browser/content_browser_client.h"
 
 #include "base/files/file_path.h"
 #include "build/build_config.h"
 #include "content/public/browser/client_certificate_delegate.h"
 #include "content/public/common/sandbox_type.h"
@@ skipping 400 matching lines @@
       L"S-1-15-2-3251537155-1984446955-2931258699-841473695-1938553385-"
       L"924012148-129201922");
 }
 
 bool ContentBrowserClient::IsWin32kLockdownEnabledForMimeType(
     const std::string& mime_type) const {
   // TODO(wfh): Enable this by default once Win32k lockdown for PPAPI processes
   // is enabled by default in Chrome. See crbug.com/523278.
   return false;
 }
-#endif
+
+bool ContentBrowserClient::ShouldUseWindowsPrefetchArgument() const {
+  return true;
+}
+#endif  // defined(OS_WIN)
 
 #if defined(VIDEO_HOLE)
 ExternalVideoSurfaceContainer*
 ContentBrowserClient::OverrideCreateExternalVideoSurfaceContainer(
     WebContents* web_contents) {
   NOTREACHED() << "Hole-punching is not supported. See crbug.com/469348.";
   return nullptr;
 }
 #endif
 
 }  // namespace content