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

chrome/browser/prefs/pref_service_browsertest.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 <string>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/path_service.h"
 #include "base/test/test_file_util.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/values.h"
 #include "build/build_config.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/browser_window_state.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/testing_profile.h"
@@ skipping 57 matching lines @@
 // This test verifies that the window position from the prefs file is restored
 // when the app restores.  This doesn't really make sense on Linux, where
 // the window manager might fight with you over positioning.  However, we
 // might be able to make this work on buildbots.
 // TODO(port): revisit this.
 
 IN_PROC_BROWSER_TEST_F(PreferenceServiceTest, Test) {
   // The window should open with the new reference profile, with window
   // placement values stored in the user data directory.
   JSONFileValueDeserializer deserializer(original_pref_file_);
-  std::unique_ptr<base::Value> root = deserializer.Deserialize(NULL, NULL);
+  std::unique_ptr<base::Value> root;
+  {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    root = deserializer.Deserialize(NULL, NULL);
+  }
 
   ASSERT_TRUE(root.get());
   ASSERT_TRUE(root->IsType(base::Value::Type::DICTIONARY));
 
   base::DictionaryValue* root_dict =
       static_cast<base::DictionaryValue*>(root.get());
 
   // Retrieve the screen rect for the launched window
   gfx::Rect bounds = browser()->window()->GetRestoredBounds();
 
@@ skipping 20 matching lines @@
   EXPECT_EQ(right, bounds.x() + bounds.width());
 
   // Find if launched window is maximized.
   bool is_window_maximized = browser()->window()->IsMaximized();
   bool is_maximized = false;
   EXPECT_TRUE(root_dict->GetBoolean(kBrowserWindowPlacement + ".maximized",
       &is_maximized));
   EXPECT_EQ(is_maximized, is_window_maximized);
 }
 #endif