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

chrome/browser/sync/test/integration/sync_extension_helper.cc

Index: chrome/browser/sync/test/integration/sync_extension_helper.cc
diff --git a/chrome/browser/sync/test/integration/sync_extension_helper.cc b/chrome/browser/sync/test/integration/sync_extension_helper.cc
index 8fcfd610e1d441759cad542de746eeee5d194caa..55322dbea6aad4583297832a077cc9f9da68faba 100644
--- a/chrome/browser/sync/test/integration/sync_extension_helper.cc
+++ b/chrome/browser/sync/test/integration/sync_extension_helper.cc
@@ -15,6 +15,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_util.h"
@@ -84,6 +85,7 @@ void SyncExtensionHelper::SetupIfNecessary(SyncTest* test) {
 
 std::string SyncExtensionHelper::InstallExtension(
     Profile* profile, const std::string& name, Manifest::Type type) {
+  base::ThreadRestrictions::ScopedAllowIO allow_io;
   scoped_refptr<Extension> extension = GetExtension(profile, name, type);
   if (!extension.get()) {
     NOTREACHED() << "Could not install extension " << name;