Fix browser crash on shutdown when ProfileImplIOData::Handle::Init isn't called.

chrome/browser/profiles/profile_impl_io_data.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/profiles/profile_impl_io_data.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 114 matching lines @@
     save_prefs = !chromeos::ProfileHelper::IsSigninProfile(profile_);
 #endif
     if (save_prefs)
       io_data_->predictor_->SaveStateForNextStartupAndTrim();
     io_data_->predictor_->ShutdownOnUIThread();
   }
 
   if (io_data_->http_server_properties_manager_)
     io_data_->http_server_properties_manager_->ShutdownOnPrefThread();
 
-  io_data_->data_reduction_proxy_io_data()->ShutdownOnUIThread();
+  // io_data_->data_reduction_proxy_io_data() might be NULL if Init() was
+  // never called.
+  if (io_data_->data_reduction_proxy_io_data())
+    io_data_->data_reduction_proxy_io_data()->ShutdownOnUIThread();
+
   io_data_->ShutdownOnUIThread(GetAllContextGetters().Pass());
 }
 
 void ProfileImplIOData::Handle::Init(
     const base::FilePath& cookie_path,
     const base::FilePath& channel_id_path,
     const base::FilePath& cache_path,
     int cache_max_size,
     const base::FilePath& media_cache_path,
     int media_cache_max_size,
@@ skipping 699 matching lines @@
     const base::Closure& completion) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   DCHECK(initialized());
 
   DCHECK(transport_security_state());
   // Completes synchronously.
   transport_security_state()->DeleteAllDynamicDataSince(time);
   DCHECK(http_server_properties_manager_);
   http_server_properties_manager_->Clear(completion);
 }