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

chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager_browsertest.cc

Index: chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager_browsertest.cc
diff --git a/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager_browsertest.cc b/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager_browsertest.cc
index d5d975c2eefd5d8997dcc71b5e278dde86f0518a..26c0c7c7f71e05dac3443209e36f68f61b9888b1 100644
--- a/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager_browsertest.cc
+++ b/chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager_browsertest.cc
@@ -16,6 +16,7 @@
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/login/users/wallpaper/wallpaper_manager_test_utils.h"
@@ -102,6 +103,7 @@ class WallpaperManagerBrowserTest : public InProcessBrowserTest {
       const char* sub_dir,
       const wallpaper::WallpaperFilesId& wallpaper_files_id,
       const std::string& id) {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     base::FilePath wallpaper_path =
         WallpaperManager::Get()->GetCustomWallpaperPath(sub_dir,
                                                         wallpaper_files_id, id);
@@ -113,6 +115,7 @@ class WallpaperManagerBrowserTest : public InProcessBrowserTest {
 
   // Logs in |account_id|.
   void LogIn(const AccountId& account_id, const std::string& user_id_hash) {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     SessionManager::Get()->CreateSession(account_id, user_id_hash);
     SessionManager::Get()->SessionStarted();
     // Flush to ensure the created session and ACTIVE state reaches ash.
@@ -152,6 +155,7 @@ class WallpaperManagerBrowserTest : public InProcessBrowserTest {
   // Only needs to be called (once) by tests that want to test loading of
   // default wallpapers.
   void CreateCmdlineWallpapers() {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     wallpaper_dir_.reset(new base::ScopedTempDir);
     ASSERT_TRUE(wallpaper_dir_->CreateUniqueTempDir());
     wallpaper_manager_test_utils::CreateCmdlineWallpapers(