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

chrome/browser/ui/browser_focus_uitest.cc

Index: chrome/browser/ui/browser_focus_uitest.cc
diff --git a/chrome/browser/ui/browser_focus_uitest.cc b/chrome/browser/ui/browser_focus_uitest.cc
index 17d0c4687b66a0a7710353d74ce374b6a3a159a6..10ed8647eeaa252651b1f7ccba9b8afc01932757 100644
--- a/chrome/browser/ui/browser_focus_uitest.cc
+++ b/chrome/browser/ui/browser_focus_uitest.cc
@@ -14,6 +14,7 @@
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ -179,6 +180,7 @@ class BrowserFocusTest : public InProcessBrowserTest {
 class TestInterstitialPage : public content::InterstitialPageDelegate {
  public:
   explicit TestInterstitialPage(WebContents* tab) {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     base::FilePath file_path;
     bool success = PathService::Get(chrome::DIR_TEST_DATA, &file_path);
     EXPECT_TRUE(success);