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

chrome/browser/extensions/api/page_capture/page_capture_apitest.cc

Index: chrome/browser/extensions/api/page_capture/page_capture_apitest.cc
diff --git a/chrome/browser/extensions/api/page_capture/page_capture_apitest.cc b/chrome/browser/extensions/api/page_capture/page_capture_apitest.cc
index 3cdf16b7efa0f2f87e112f420aa44ff1bd0f2804..035b46242d7a81c73cb21ce3b4678e3a8a5be20e 100644
--- a/chrome/browser/extensions/api/page_capture/page_capture_apitest.cc
+++ b/chrome/browser/extensions/api/page_capture/page_capture_apitest.cc
@@ -4,6 +4,7 @@
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/browser/extensions/api/page_capture/page_capture_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/common/chrome_switches.h"
@@ -54,6 +55,7 @@ IN_PROC_BROWSER_TEST_F(ExtensionPageCaptureApiTest, SaveAsMHTML) {
   content::RunAllPendingInMessageLoop(content::BrowserThread::IO);
   // Make sure the temporary file is destroyed once the javascript side reads
   // the contents.
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   ASSERT_FALSE(base::PathExists(delegate.temp_file_));
 }
 
@@ -73,6 +75,7 @@ IN_PROC_BROWSER_TEST_F(ExtensionPageCaptureApiTest,
   ASSERT_FALSE(delegate.temp_file_.empty());
   content::RunAllPendingInMessageLoop(content::BrowserThread::FILE);
   content::RunAllPendingInMessageLoop(content::BrowserThread::IO);
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   ASSERT_FALSE(base::PathExists(delegate.temp_file_));
 }