OOPIF: Clear old focused frame when focus moves to a cross-process frame.

third_party/WebKit/Source/web/WebLocalFrameImpl.cpp

Index: third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
index 086a79881696112c584d0d849db0724672006d89..f101593c265bd269854e7b9bafd650e18f36be42 100644
--- a/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
+++ b/third_party/WebKit/Source/web/WebLocalFrameImpl.cpp
@@ -1360,6 +1360,13 @@ void WebLocalFrameImpl::setCaretVisible(bool visible)
     frame()->selection().setCaretVisible(visible);
 }
 
+void WebLocalFrameImpl::clearFocus()
+{
+    // This uses setFocusedElement rather than setFocusedFrame so that blur
+    // events are properly dispatched on any currently focused elements.
+    frame()->page()->focusController().setFocusedElement(nullptr, nullptr);
+}
+
 VisiblePosition WebLocalFrameImpl::visiblePositionForViewportPoint(const WebPoint& pointInViewport)
 {
     return visiblePositionForContentsPoint(frame()->view()->viewportToContents(pointInViewport), frame());