Selection API of INPUT/TEXTAREA should not update FrameSelection without focusing.

third_party/WebKit/LayoutTests/editing/selection/4975120.html

Index: third_party/WebKit/LayoutTests/editing/selection/4975120.html
diff --git a/third_party/WebKit/LayoutTests/editing/selection/4975120.html b/third_party/WebKit/LayoutTests/editing/selection/4975120.html
index 7c1cf331c72592af703975a770285806a6406eb2..efb7ae87fc2808a608044ed2c86b7a8f58da4dbc 100644
--- a/third_party/WebKit/LayoutTests/editing/selection/4975120.html
+++ b/third_party/WebKit/LayoutTests/editing/selection/4975120.html
@@ -6,6 +6,7 @@ if (window.testRunner)
 function runTest() {
     var input = document.getElementById("input");
     input.setSelectionRange(0, 3);
+    input.focus();
     var frame = frames[0];
     frame.focus();
     frame.getSelection().collapse(frame.document.body, 0);