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

content/browser/gpu/gpu_process_host.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/browser/gpu/gpu_process_host.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <list>
@@ skipping 990 matching lines @@
 
   base::CommandLine* cmd_line = new base::CommandLine(exe_path);
 #endif
   cmd_line->AppendSwitchASCII(switches::kProcessType, switches::kGpuProcess);
   cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id);
   cmd_line->AppendSwitchASCII(switches::kMojoApplicationChannelToken,
                               mojo_application_host_->GetToken());
   BrowserChildProcessHostImpl::CopyFeatureAndFieldTrialFlags(cmd_line);
 
 #if defined(OS_WIN)
-  if (GetContentClient()->browser()->ShouldUseWindowsPrefetchArgument())
-    cmd_line->AppendArg(switches::kPrefetchArgumentGpu);
+  cmd_line->AppendArg(switches::kPrefetchArgumentGpu);
 #endif  // defined(OS_WIN)
 
   if (kind_ == GPU_PROCESS_KIND_UNSANDBOXED)
     cmd_line->AppendSwitch(switches::kDisableGpuSandbox);
 
   // TODO(penghuang): Replace all GPU related switches with GpuPreferences.
   // https://crbug.com/590825
   // If you want a browser command-line switch passed to the GPU process
   // you need to add it to |kSwitchNames| at the beginning of this file.
   cmd_line->CopySwitchesFrom(browser_command_line, kSwitchNames,
@@ skipping 169 matching lines @@
   TRACE_EVENT0("gpu", "GpuProcessHost::OnCacheShader");
   ClientIdToShaderCacheMap::iterator iter =
       client_id_to_shader_cache_.find(client_id);
   // If the cache doesn't exist then this is an off the record profile.
   if (iter == client_id_to_shader_cache_.end())
     return;
   iter->second->Cache(GetShaderPrefixKey() + ":" + key, shader);
 }
 
 }  // namespace content