Clear last MouseMove root view in RWHIER if that view gets destroyed

content/browser/renderer_host/render_widget_host_view_base.cc

Index: content/browser/renderer_host/render_widget_host_view_base.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_base.cc b/content/browser/renderer_host/render_widget_host_view_base.cc
index 292087df62bcaaeb01056b98e027d4e7bb9031c1..28b36981dba2dc16bff3546c10449e317efb8cbb 100644
--- a/content/browser/renderer_host/render_widget_host_view_base.cc
+++ b/content/browser/renderer_host/render_widget_host_view_base.cc
@@ -457,6 +457,10 @@ bool RenderWidgetHostViewBase::IsRenderWidgetHostViewGuest() {
   return false;
 }
 
+bool RenderWidgetHostViewBase::IsRenderWidgetHostViewChildFrame() {
+  return false;
+}
+
 void RenderWidgetHostViewBase::TextInputStateChanged(
     const TextInputState& text_input_state) {
 // TODO(ekaramad): Use TextInputManager code paths for IME on other platforms.