Allow signin to continue even if sync is disabled by policy.

chrome/browser/profiles/profile_impl.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.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 863 matching lines @@
   return io_data_.GetExtensionsRequestContextGetter();
 }
 
 net::URLRequestContextGetter* ProfileImpl::GetRequestContextForStoragePartition(
     const FilePath& partition_path,
     bool in_memory) {
   return io_data_.GetIsolatedAppRequestContextGetter(partition_path, in_memory);
 }
 
 net::SSLConfigService* ProfileImpl::GetSSLConfigService() {
+  // If ssl_config_service_manager_ is null, this typically means that some
+  // ProfileKeyedService is trying to create a RequestContext at startup, but
+  // SSLConfigServiceManager is not initialized until DoFinalInit() which is
+  // invoked after all ProfileKeyedServices have been initialized (see
+  // http://crbug.com/171406).
+  DCHECK(ssl_config_service_manager_.get()) <<
+      "SSLConfigServiceManager is not initialized yet";
   return ssl_config_service_manager_->Get();
 }
 
 HostContentSettingsMap* ProfileImpl::GetHostContentSettingsMap() {
   if (!host_content_settings_map_.get()) {
     host_content_settings_map_ = new HostContentSettingsMap(GetPrefs(), false);
   }
   return host_content_settings_map_.get();
 }
 
@@ skipping 272 matching lines @@
                                      FilePath* cache_path,
                                      int* max_size) {
   DCHECK(cache_path);
   DCHECK(max_size);
   FilePath path(prefs_->GetFilePath(prefs::kDiskCacheDir));
   if (!path.empty())
     *cache_path = path;
   *max_size = is_media_context ? prefs_->GetInteger(prefs::kMediaCacheSize) :
                                  prefs_->GetInteger(prefs::kDiskCacheSize);
 }