Do not invoke or clear hover effects on node deletion when cursor is invisible

LayoutTests/fast/dom/hover-after-dom-delete-expected.txt

Index: LayoutTests/fast/dom/hover-after-dom-delete-expected.txt
diff --git a/LayoutTests/fast/dom/hover-after-dom-delete-expected.txt b/LayoutTests/fast/dom/hover-after-dom-delete-expected.txt
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+++ b/LayoutTests/fast/dom/hover-after-dom-delete-expected.txt
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+Test for http://crbug.com/240722. If the mouse cursor is not visible, no new hover effects should be invoked when the currently hovered node is removed from the DOM. Press any key to delete the red div.
+
+Adding the red and blue divs.
+PASS blueDiv.offsetTop is 200
+PASS redDiv.offsetTop is 50
+Mouse is visible, moving it over the red div.
+PASS redDiv.innerHTML is "Red hovered."
+PASS blueDiv.innerHTML is ""
+Mouse is visible, deleting the red div.
+PASS blueDiv.offsetTop is 50
+PASS blueText is "'Hovered.'"
+Adding the red and blue divs.
+PASS blueDiv.offsetTop is 200
+PASS redDiv.offsetTop is 50
+Mouse is visible, moving it over the red div.
+PASS redDiv.innerHTML is "Red hovered."
+PASS blueDiv.innerHTML is ""
+Setting the mouse cursor to be invisible.
+PASS redDiv.innerHTML is "Red hovered."
+PASS blueDiv.innerHTML is ""
+Mouse is invisible, deleting the red div.
+PASS blueDiv.offsetTop is 50
+PASS blueText is ""
+