Fix integration tests in src/chrome and src/extensions so that we can turn on IO thread checks wi...

chrome/browser/extensions/content_verifier_browsertest.cc

 // Copyright 2014 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 <list>
 #include <set>
 #include <string>
 
 #include "base/bind_helpers.h"
 #include "base/callback_helpers.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/run_loop.h"
 #include "base/scoped_observer.h"
 #include "base/strings/string_split.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/extensions/browsertest_util.h"
 #include "chrome/browser/extensions/chrome_content_verifier_delegate.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_management_test_util.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/policy_extension_reinstaller.h"
 #include "chrome/common/chrome_switches.h"
 #include "components/policy/core/browser/browser_policy_connector.h"
 #include "components/policy/core/common/mock_configuration_policy_provider.h"
@@ skipping 509 matching lines @@
     job_observer.ExpectJobResult(id, script_relfilepath,
                                  JobObserver::Result::SUCCESS);
     EnableExtension(id);
     EXPECT_TRUE(job_observer.WaitForExpectedJobs());
 
     // Now alter the contents of the content script, reload the extension, and
     // expect to see a job failure due to the content script content hash not
     // being what was signed by the webstore.
     base::FilePath scriptfile = extension->path().AppendASCII(script_relpath);
     std::string extra = "some_extra_function_call();";
-    ASSERT_TRUE(base::AppendToFile(scriptfile, extra.data(), extra.size()));
+    {
+      base::ThreadRestrictions::ScopedAllowIO allow_io;
+      ASSERT_TRUE(base::AppendToFile(scriptfile, extra.data(), extra.size()));
+    }
     DisableExtension(id);
     job_observer.ExpectJobResult(id, script_relfilepath,
                                  JobObserver::Result::FAILURE);
     EnableExtension(id);
     EXPECT_TRUE(job_observer.WaitForExpectedJobs());
   }
 
  protected:
   JobDelegate delegate_;
   GURL page_url_;
@@ skipping 343 matching lines @@
   // Remove the override and set ExtensionService to update again. The extension
   // should be now installed.
   PolicyExtensionReinstaller::set_policy_reinstall_action_for_test(nullptr);
   service->set_external_updates_disabled_for_test(false);
   delay_tracker.Proceed();
 
   EXPECT_TRUE(registry_observer.WaitForInstall(id_));
 }
 
 }  // namespace extensions