Remove all but one use of WeakPtrFactory::DetachFromThread.

net/proxy/dhcp_proxy_script_adapter_fetcher_win.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 "net/proxy/dhcp_proxy_script_adapter_fetcher_win.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/message_loop_proxy.h"
@@ skipping 23 matching lines @@
 DhcpProxyScriptAdapterFetcher::DhcpProxyScriptAdapterFetcher(
     URLRequestContext* url_request_context)
     : state_(STATE_START),
       result_(ERR_IO_PENDING),
       url_request_context_(url_request_context) {
   DCHECK(url_request_context_);
 }
 
 DhcpProxyScriptAdapterFetcher::~DhcpProxyScriptAdapterFetcher() {
   Cancel();
-
-  // The WeakPtr we passed to the worker thread may be destroyed on the
-  // worker thread.  This detaches any outstanding WeakPtr state from
-  // the current thread.
-  base::SupportsWeakPtr<DhcpProxyScriptAdapterFetcher>::DetachFromThread();
 }
 
 void DhcpProxyScriptAdapterFetcher::Fetch(
     const std::string& adapter_name, const CompletionCallback& callback) {
   DCHECK(CalledOnValidThread());
   DCHECK_EQ(state_, STATE_START);
   result_ = ERR_IO_PENDING;
   pac_script_ = base::string16();
   state_ = STATE_WAIT_DHCP;
   callback_ = callback;
@@ skipping 225 matching lines @@
     // back a buffer with embedded NULLs, something is broken anyway.
     return std::string(
         std::string(reinterpret_cast<const char *>(wpad_params.Data),
                     wpad_params.nBytesData).c_str());
   }
 
   return "";
 }
 
 }  // namespace net