Don't show caret when containing element doesn't have focus

LayoutTests/editing/caret/caret-is-hidden-when-no-focus-expected.html

Index: LayoutTests/editing/caret/caret-is-hidden-when-no-focus-expected.html
diff --git a/LayoutTests/editing/caret/caret-is-hidden-when-no-focus-expected.html b/LayoutTests/editing/caret/caret-is-hidden-when-no-focus-expected.html
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+++ b/LayoutTests/editing/caret/caret-is-hidden-when-no-focus-expected.html
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+<p>Caret should be hidden when no focus</p>
+Manual steps:
+<ol>
+<li>Click middle of "edit me!" to show caret.</li>
+<li>Click checkbox.</li>
+<li>Caret should be hidden.</li>
+</ol>
+<div contenteditable="true">edit me!</div>
+<input type="checkbox">
+<script>
+if (window.eventSender) {
+    var checkbox = document.querySelector('input');
+    eventSender.mouseMoveTo(checkbox.offsetLeft + 5, checkbox.offsetTop + 5);
+    eventSender.mouseDown();
+    eventSender.mouseUp();
+}
+</script>
+