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

chrome/browser/sessions/session_restore_browsertest.cc

Index: chrome/browser/sessions/session_restore_browsertest.cc
diff --git a/chrome/browser/sessions/session_restore_browsertest.cc b/chrome/browser/sessions/session_restore_browsertest.cc
index 324bf098dc6a241e0d99b0a2ff2b5e6f72667e44..db9b2bc784e1cb7ed035745fffd1cee480317f5b 100644
--- a/chrome/browser/sessions/session_restore_browsertest.cc
+++ b/chrome/browser/sessions/session_restore_browsertest.cc
@@ -16,6 +16,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/process/launch.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/defaults.h"
@@ -1450,6 +1451,7 @@ IN_PROC_BROWSER_TEST_F(SessionRestoreTest, SessionStorageAfterTabReplace) {
 }
 
 IN_PROC_BROWSER_TEST_F(SessionRestoreTest, TabWithDownloadDoesNotGetRestored) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   base::ScopedTempDir download_directory;
   ASSERT_TRUE(download_directory.CreateUniqueTempDir());
   ASSERT_TRUE(embedded_test_server()->Start());