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

chrome/browser/extensions/startup_helper_browsertest.cc

 // Copyright (c) 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 <vector>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/browser/extensions/startup_helper.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 
 class StartupHelperBrowserTest : public InProcessBrowserTest {
  public:
   StartupHelperBrowserTest() {}
   ~StartupHelperBrowserTest() override {}
 
@@ skipping 22 matching lines @@
 
   for (std::vector<std::pair<base::FilePath, bool> >::iterator i =
            expectations.begin();
        i != expectations.end(); ++i) {
     base::CommandLine command_line(base::CommandLine::NO_PROGRAM);
     const base::FilePath& path = i->first;
     command_line.AppendSwitchPath(switches::kValidateCrx, path);
 
     std::string error;
     extensions::StartupHelper helper;
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     bool result = helper.ValidateCrx(command_line, &error);
     if (i->second) {
       EXPECT_TRUE(result) << path.LossyDisplayName()
                           << " expected to be valid but wasn't";
     } else {
       EXPECT_FALSE(result) << path.LossyDisplayName()
                            << " expected to be invalid but wasn't";
       EXPECT_FALSE(error.empty()) << "Error message wasn't set for "
                                   << path.LossyDisplayName();
     }
   }
 }