Make sure FrameScheduler is cleared when LocalFrame::detach() finishes

components/scheduler/renderer/web_frame_scheduler_impl.cc

Index: components/scheduler/renderer/web_frame_scheduler_impl.cc
diff --git a/components/scheduler/renderer/web_frame_scheduler_impl.cc b/components/scheduler/renderer/web_frame_scheduler_impl.cc
index fba6b691b5c96ded5f4c44566bfd3f9bd137b95e..67a0bce7afe31e626de44f4d01596e1494491556 100644
--- a/components/scheduler/renderer/web_frame_scheduler_impl.cc
+++ b/components/scheduler/renderer/web_frame_scheduler_impl.cc
@@ -22,7 +22,7 @@ WebFrameSchedulerImpl::WebFrameSchedulerImpl(
     base::trace_event::BlameContext* blame_context)
     : renderer_scheduler_(renderer_scheduler),
       parent_web_view_scheduler_(parent_web_view_scheduler),
-      blame_context_(blame_context),
+      blame_context_(blame_context ? blame_context->weak_ptr() : nullptr),
       frame_visible_(true),
       page_visible_(true) {}
 
@@ -55,7 +55,7 @@ blink::WebTaskRunner* WebFrameSchedulerImpl::loadingTaskRunner() {
   if (!loading_web_task_runner_) {
     loading_task_queue_ =
         renderer_scheduler_->NewLoadingTaskRunner("frame_loading_tq");
-    loading_task_queue_->SetBlameContext(blame_context_);
+    loading_task_queue_->SetBlameContext(blame_context_.get());
     if (parent_web_view_scheduler_->virtual_time_domain()) {
       loading_task_queue_->SetTimeDomain(
           parent_web_view_scheduler_->virtual_time_domain());
@@ -70,7 +70,7 @@ blink::WebTaskRunner* WebFrameSchedulerImpl::timerTaskRunner() {
   if (!timer_web_task_runner_) {
     timer_task_queue_ =
         renderer_scheduler_->NewTimerTaskRunner("frame_timer_tq");
-    timer_task_queue_->SetBlameContext(blame_context_);
+    timer_task_queue_->SetBlameContext(blame_context_.get());
     if (parent_web_view_scheduler_->virtual_time_domain()) {
       timer_task_queue_->SetTimeDomain(
           parent_web_view_scheduler_->virtual_time_domain());