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

third_party/WebKit/Source/core/frame/LocalFrame.cpp

Index: third_party/WebKit/Source/core/frame/LocalFrame.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalFrame.cpp b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
index 68ff6e0e920b56189424e7e442f1b099973e9f43..7d4a544bd34fe7dcf3a8cf3d94ea33c2d62e9f0d 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrame.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalFrame.cpp
@@ -335,6 +335,8 @@ void LocalFrame::detach(FrameDetachType type)
     // - Document::detach()'s deferred widget updates can run script.
     ScriptForbiddenScope forbidScript;
     m_loader.clear();
+    // Clear FrameScheduler again in case it is recreated in scripting.
+    m_frameScheduler.reset();
     if (!client())
         return;