Refactored the CloudPolicyProvider so that it becomes initialized once and stays initialized.

chrome/browser/policy/user_policy_disk_cache.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/policy/user_policy_disk_cache.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
@@ skipping 28 matching lines @@
 UserPolicyDiskCache::Delegate::~Delegate() {}
 
 UserPolicyDiskCache::UserPolicyDiskCache(
     const base::WeakPtr<Delegate>& delegate,
     const FilePath& backing_file_path)
     : delegate_(delegate),
       backing_file_path_(backing_file_path) {}
 
 void UserPolicyDiskCache::Load() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-  BrowserThread::PostTask(
+  bool ret = BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&UserPolicyDiskCache::LoadOnFileThread, this));
+  DCHECK(ret);
 }
 
 void UserPolicyDiskCache::Store(
     const em::CachedCloudPolicyResponse& policy) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&UserPolicyDiskCache::StoreOnFileThread, this, policy));
 }
 
@@ skipping 77 matching lines @@
   int size = data.size();
   if (file_util::WriteFile(backing_file_path_, data.c_str(), size) != size) {
     LOG(WARNING) << "Failed to write " << backing_file_path_.value();
     SampleUMA(kMetricPolicyStoreFailed);
     return;
   }
   SampleUMA(kMetricPolicyStoreSucceeded);
 }
 
 }  // namespace policy