Change BrowserThreadDelegate to run Init() async.

chrome/browser/io_thread.h

 // 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.
 
 #ifndef CHROME_BROWSER_IO_THREAD_H_
 #define CHROME_BROWSER_IO_THREAD_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 193 matching lines @@
 
  private:
   // Provide SystemURLRequestContextGetter with access to
   // InitSystemRequestContext().
   friend class SystemURLRequestContextGetter;
 
   // BrowserThreadDelegate implementation, runs on the IO thread.
   // This handles initialization and destruction of state that must
   // live on the IO thread.
   virtual void Init() OVERRIDE;
+  virtual void InitAsync() OVERRIDE;
   virtual void CleanUp() OVERRIDE;
 
   void InitializeNetworkOptions(const CommandLine& parsed_command_line);
 
   // Enable the SPDY protocol.  If this function is not called, SPDY/3
   // will be enabled.
   //   "off"                      : Disables SPDY support entirely.
   //   "ssl"                      : Forces SPDY for all HTTPS requests.
   //   "no-ssl"                   : Forces SPDY for all HTTP requests.
   //   "no-ping"                  : Disables SPDY ping connection testing.
@@ skipping 84 matching lines @@
 
   // True if SPDY is disabled by policy.
   bool is_spdy_disabled_by_policy_;
 
   base::WeakPtrFactory<IOThread> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(IOThread);
 };
 
 #endif  // CHROME_BROWSER_IO_THREAD_H_