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

chrome/test/base/javascript_browser_test.cc

Index: chrome/test/base/javascript_browser_test.cc
diff --git a/chrome/test/base/javascript_browser_test.cc b/chrome/test/base/javascript_browser_test.cc
index c70778b7738b0e5396a05d44275fb64001e1c799..e1f1829ed08eee080dd2630c6723e76ec471ddc1 100644
--- a/chrome/test/base/javascript_browser_test.cc
+++ b/chrome/test/base/javascript_browser_test.cc
@@ -7,6 +7,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
+#include "base/threading/thread_restrictions.h"
 #include "chrome/common/chrome_paths.h"
 #include "content/public/browser/web_ui.h"
 #include "ui/base/resource/resource_bundle.h"
@@ -66,6 +67,7 @@ void JavaScriptBrowserTest::SetUpOnMainThread() {
 // calls.
 void JavaScriptBrowserTest::BuildJavascriptLibraries(
     std::vector<base::string16>* libraries) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   ASSERT_TRUE(libraries != NULL);
   std::vector<base::FilePath>::iterator user_libraries_iterator;
   for (user_libraries_iterator = user_libraries_.begin();