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

chrome/browser/ui/find_bar/find_bar_host_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 <stddef.h>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 417 matching lines @@
 // Find a very long string in a large page.
 IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, FindLongString) {
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
   ui_test_utils::NavigateToURL(browser(), GetURL("largepage.html"));
 
   base::FilePath path = ui_test_utils::GetTestFilePath(
       base::FilePath().AppendASCII("find_in_page"),
       base::FilePath().AppendASCII("LongFind.txt"));
   std::string query;
-  base::ReadFileToString(path, &query);
+  {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    base::ReadFileToString(path, &query);
+  }
   EXPECT_EQ(1, FindInPage16(web_contents, base::UTF8ToUTF16(query),
                             kFwd, kIgnoreCase, NULL));
 }
 
 // Find a big font string in a page.
 IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, BigString) {
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
   ui_test_utils::NavigateToURL(browser(), GetURL("BigText.html"));
   EXPECT_EQ(1, FindInPageASCII(web_contents, "SomeLargeString",
@@ skipping 45 matching lines @@
 IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, FindWholeFileContent) {
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
 
   base::FilePath path = ui_test_utils::GetTestFilePath(
       base::FilePath().AppendASCII("find_in_page"),
       base::FilePath().AppendASCII("find_test.txt"));
   ui_test_utils::NavigateToURL(browser(), net::FilePathToFileURL(path));
 
   std::string query;
-  base::ReadFileToString(path, &query);
+  {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
+    base::ReadFileToString(path, &query);
+  }
   EXPECT_EQ(1, FindInPage16(web_contents, base::UTF8ToUTF16(query),
                             false, false, NULL));
 }
 
 // This test loads a single-frame page and makes sure the ordinal returned makes
 // sense as we FindNext over all the items.
 IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, FindInPageOrdinal) {
   // First we navigate to our page.
   GURL url = GetURL(kFrameData);
   ui_test_utils::NavigateToURL(browser(), url);
@@ skipping 1047 matching lines @@
 
   EXPECT_TRUE(chrome::ExecuteCommand(browser_incognito, IDC_FIND_NEXT));
   WebContents* web_contents_incognito =
       browser_incognito->tab_strip_model()->GetActiveWebContents();
   ui_test_utils::FindInPageNotificationObserver observer(
       web_contents_incognito);
   observer.Wait();
   EXPECT_EQ(ASCIIToUTF16("bar"),
             GetFindBarTextForBrowser(browser_incognito));
 }