Convert nacl browser testrunner

components/nacl/browser/nacl_browser.cc

 // Copyright 2013 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 "components/nacl/browser/nacl_browser.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/files/file_proxy.h"
@@ skipping 262 matching lines @@
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   EnsureIrtAvailable();
   EnsureValidationCacheAvailable();
 }
 
 // Load the IRT async.
 void NaClBrowser::EnsureIrtAvailable() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   if (IsOk() && irt_state_ == NaClResourceUninitialized) {
     irt_state_ = NaClResourceRequested;
-    // TODO(ncbray) use blocking pool.
+    auto task_runner = base::CreateTaskRunnerWithTraits(
+        {base::MayBlock , base::TaskPriority::BACKGROUND,
+              base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN});
     std::unique_ptr<base::FileProxy> file_proxy(
-        new base::FileProxy(content::BrowserThread::GetTaskRunnerForThread(
-                                content::BrowserThread::FILE)
-                                .get()));
+        new base::FileProxy(task_runner.get()));
     base::FileProxy* proxy = file_proxy.get();
     if (!proxy->CreateOrOpen(
             irt_filepath_, base::File::FLAG_OPEN | base::File::FLAG_READ,
             base::Bind(&NaClBrowser::OnIrtOpened, base::Unretained(this),
                        base::Passed(&file_proxy)))) {
       LOG(ERROR) << "Internal error, NaCl disabled.";
       MarkAsFailed();
     }
   }
 }
@@ skipping 310 matching lines @@
 bool NaClBrowser::IsThrottled() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   if (crash_times_.size() != kMaxCrashesPerInterval) {
     return false;
   }
   base::TimeDelta delta = base::Time::Now() - crash_times_.front();
   return delta.InSeconds() <= kCrashesIntervalInSeconds;
 }
 
 }  // namespace nacl