Allow MainThreadEventQueue to call the RenderWidget directly.

content/renderer/idle_user_detector.cc

Index: content/renderer/idle_user_detector.cc
diff --git a/content/renderer/idle_user_detector.cc b/content/renderer/idle_user_detector.cc
index 43979cfb722ebbbb322b822c0d665c78a998475d..4a4f33e6b5faaad5ee1a60cbce6fdcd672af8772 100644
--- a/content/renderer/idle_user_detector.cc
+++ b/content/renderer/idle_user_detector.cc
@@ -25,11 +25,7 @@ bool IdleUserDetector::OnMessageReceived(const IPC::Message& message) {
   return false;
 }
 
-void IdleUserDetector::OnHandleInputEvent(
-    const blink::WebInputEvent* event,
-    const std::vector<const blink::WebInputEvent*>& coalesced_events,
-    const ui::LatencyInfo& latency_info,
-    InputEventDispatchType dispatch_type) {
+void IdleUserDetector::ActivityDetected() {
   if (GetContentClient()->renderer()->RunIdleHandlerWhenWidgetsHidden()) {
     RenderThreadImpl* render_thread = RenderThreadImpl::current();
     if (render_thread != NULL) {
@@ -38,8 +34,15 @@ void IdleUserDetector::OnHandleInputEvent(
   }
 }
 
+void IdleUserDetector::OnHandleInputEvent(
+    const blink::WebInputEvent* event,
+    const std::vector<const blink::WebInputEvent*>& coalesced_events,
+    const ui::LatencyInfo& latency_info,
+    InputEventDispatchType dispatch_type) {
+  ActivityDetected();
+}
+
 void IdleUserDetector::OnDestruct() {
-  delete this;
 }
 
 }  // namespace content