Don't post multiple task for executing blocked scripts.

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index 3bc2657a5f609d7db757599f8e4dbe79d87420f1..5270a9126081f9e6297c41fe033c08ba781b95e6 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -3356,6 +3356,9 @@ void Document::didRemoveAllPendingStylesheet() {
 }
 
 void Document::didLoadAllScriptBlockingResources() {
+  if (m_executeScriptsWaitingForResourcesTaskHandle.isActive())
+    return;
+
   // Use wrapWeakPersistent because the task should not keep this Document alive
   // just for executing scripts.
   m_executeScriptsWaitingForResourcesTaskHandle =