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

chrome/test/base/in_process_browser_test.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/test/base/in_process_browser_test.h"
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/feature_list.h"
@@ skipping 281 matching lines @@
 
   // TODO(pkotwicz): Investigate if we can remove this switch.
   if (exit_when_last_browser_closes_)
     command_line->AppendSwitch(switches::kDisableZeroBrowsersOpenForTests);
 
   if (open_about_blank_on_browser_launch_ && command_line->GetArgs().empty())
     command_line->AppendArg(url::kAboutBlankURL);
 }
 
 bool InProcessBrowserTest::RunAccessibilityChecks(std::string* error_message) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   if (!browser()) {
     *error_message = "browser is NULL";
     return false;
   }
   auto* tab_strip = browser()->tab_strip_model();
   if (!tab_strip) {
     *error_message = "tab_strip is NULL";
     return false;
   }
   auto* web_contents = tab_strip->GetActiveWebContents();
@@ skipping 309 matching lines @@
   // On the Mac, this eventually reaches
   // -[BrowserWindowController windowWillClose:], which will post a deferred
   // -autorelease on itself to ultimately destroy the Browser object. The line
   // below is necessary to pump these pending messages to ensure all Browsers
   // get deleted.
   content::RunAllPendingInMessageLoop();
   delete autorelease_pool_;
   autorelease_pool_ = NULL;
 #endif
 }