Use loading task queue in ScriptInjectionManager

extensions/renderer/script_injection_manager.cc

Index: extensions/renderer/script_injection_manager.cc
diff --git a/extensions/renderer/script_injection_manager.cc b/extensions/renderer/script_injection_manager.cc
index 1e872e245909748d0ffef6b0814f5ea2117c400c..9902eee9b09a0af3ca33b312815b66eb4d17257e 100644
--- a/extensions/renderer/script_injection_manager.cc
+++ b/extensions/renderer/script_injection_manager.cc
@@ -184,7 +184,7 @@ void ScriptInjectionManager::RFOHelper::DidFinishDocumentLoad() {
   // particularly slow subresource, so we set a delayed task from here - but if
   // we finish everything before that point (i.e., DidFinishLoad() is
   // triggered), then there's no reason to keep waiting.
-  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
+  render_frame()->GetLoadingTaskRunner()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&ScriptInjectionManager::RFOHelper::RunIdle,
                  weak_factory_.GetWeakPtr()),
@@ -194,7 +194,7 @@ void ScriptInjectionManager::RFOHelper::DidFinishDocumentLoad() {
 void ScriptInjectionManager::RFOHelper::DidFinishLoad() {
   DCHECK(content::RenderThread::Get());
   // Ensure that we don't block any UI progress by running scripts.
-  base::ThreadTaskRunnerHandle::Get()->PostTask(
+  render_frame()->GetLoadingTaskRunner()->PostTask(
       FROM_HERE,
       base::Bind(&ScriptInjectionManager::RFOHelper::RunIdle,
                  weak_factory_.GetWeakPtr()));