Should not call FocusController::setFocusedFrame() for detached frame

third_party/WebKit/Source/core/page/FocusController.cpp

Index: third_party/WebKit/Source/core/page/FocusController.cpp
diff --git a/third_party/WebKit/Source/core/page/FocusController.cpp b/third_party/WebKit/Source/core/page/FocusController.cpp
index c7d11a226f30bdcff86214c2462d43f70a5ee4cc..9ec49ab3ac17cf3e90a38db115f94786029d39fc 100644
--- a/third_party/WebKit/Source/core/page/FocusController.cpp
+++ b/third_party/WebKit/Source/core/page/FocusController.cpp
@@ -772,6 +772,11 @@ void FocusController::focusDocumentView(Frame* frame, bool notifyEmbedder)
             dispatchFocusEvent(*document, *focusedElement);
     }
 
+    // dispatchBlurEvent/dispatchFocusEvent could have changed the focused frame, or
+    // detached the frame.
+    if (newFocusedFrame && !newFocusedFrame->view())
+        return;
+
     setFocusedFrame(frame, notifyEmbedder);
 }