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

chrome/browser/extensions/api/streams_private/streams_private_apitest.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 <utility>
 
 #include "base/command_line.h"
 #include "base/run_loop.h"
+#include "base/threading/thread_restrictions.h"
 #include "build/build_config.h"
 #include "chrome/browser/download/download_prefs.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/extensions/api/streams_private.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "components/prefs/pref_service.h"
@@ skipping 124 matching lines @@
   }
 
   void TearDownOnMainThread() override {
     // Tear down the test server.
     EXPECT_TRUE(test_server_->ShutdownAndWaitUntilComplete());
     test_server_.reset();
     ExtensionApiTest::TearDownOnMainThread();
   }
 
   void InitializeDownloadSettings() {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     ASSERT_TRUE(browser());
     ASSERT_TRUE(downloads_dir_.CreateUniqueTempDir());
 
     // Setup default downloads directory to the scoped tmp directory created for
     // the test.
     browser()->profile()->GetPrefs()->SetFilePath(
         prefs::kDownloadDefaultDirectory, downloads_dir_.GetPath());
     // Ensure there are no prompts for download during the test.
     browser()->profile()->GetPrefs()->SetBoolean(
         prefs::kPromptForDownload, false);
@@ skipping 282 matching lines @@
   base::RunLoop().RunUntilIdle();
   EXPECT_TRUE(catcher.GetNextResult());
 
   ui_test_utils::NavigateToURL(browser(),
                                test_server_->GetURL("/abort.rtf"));
   base::RunLoop().RunUntilIdle();
   EXPECT_TRUE(catcher.GetNextResult());
 }
 
 }  // namespace