Revert a workaround commit for a UAF crash.

chrome/browser/net/chrome_url_request_context.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 "chrome/browser/net/chrome_url_request_context.h"
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 280 matching lines @@
                                 protocol_handlers));
 }
 
 // ----------------------------------------------------------------------------
 // ChromeURLRequestContext
 // ----------------------------------------------------------------------------
 
 ChromeURLRequestContext::ChromeURLRequestContext(
     ContextType type,
     chrome_browser_net::LoadTimeStats* load_time_stats)
-    : load_time_stats_(load_time_stats) {
+    : weak_factory_(this),
+      load_time_stats_(load_time_stats) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (load_time_stats_)
     load_time_stats_->RegisterURLRequestContext(this, type);
 }
 
 ChromeURLRequestContext::~ChromeURLRequestContext() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   if (load_time_stats_)
     load_time_stats_->UnregisterURLRequestContext(this);
 }
 
 void ChromeURLRequestContext::CopyFrom(ChromeURLRequestContext* other) {
   URLRequestContext::CopyFrom(other);
 
   // Copy ChromeURLRequestContext parameters.
 }