Views: Extract text selection code from Textfield.

ui/views/controls/textfield/textfield_model.cc

Index: ui/views/controls/textfield/textfield_model.cc
diff --git a/ui/views/controls/textfield/textfield_model.cc b/ui/views/controls/textfield/textfield_model.cc
index dc1bc5539ef39a35a37a72714a9ad13923daf36a..7ca54d4f9b22fc48353ac58318f534894ef67522 100644
--- a/ui/views/controls/textfield/textfield_model.cc
+++ b/ui/views/controls/textfield/textfield_model.cc
@@ -431,10 +431,7 @@ bool TextfieldModel::MoveCursorTo(const gfx::SelectionModel& cursor) {
 bool TextfieldModel::MoveCursorTo(const gfx::Point& point, bool select) {
   if (HasCompositionText())
     ConfirmCompositionText();
-  gfx::SelectionModel cursor = render_text_->FindCursorPosition(point);
-  if (select)
-    cursor.set_selection_start(render_text_->selection().start());
-  return render_text_->MoveCursorTo(cursor);
+  return render_text_->MoveCursorTo(point, select);
 }
 
 base::string16 TextfieldModel::GetSelectedText() const {