Eagerly dispose of ScheduledActions (reland.)

third_party/WebKit/Source/bindings/core/v8/ScheduledAction.cpp

Index: third_party/WebKit/Source/bindings/core/v8/ScheduledAction.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScheduledAction.cpp b/third_party/WebKit/Source/bindings/core/v8/ScheduledAction.cpp
index 403c3d14ba72dfbed30bcb54ea92f4982612322a..f0c1db8d9b36888368e3114af066449d64f0a572 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScheduledAction.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/ScheduledAction.cpp
@@ -61,7 +61,17 @@ DEFINE_TRACE(ScheduledAction) {
   visitor->trace(m_code);
 }
 
-ScheduledAction::~ScheduledAction() {}
+ScheduledAction::~ScheduledAction() {
+  // Verify that owning DOMTimer has eagerly disposed.
+  DCHECK(m_info.IsEmpty());
+}
+
+void ScheduledAction::dispose() {
+  m_code.dispose();
+  m_info.Clear();
+  m_function.clear();
+  m_scriptState.clear();
+}
 
 void ScheduledAction::execute(ExecutionContext* context) {
   if (context->isDocument()) {