MacViews: Implement Force Touch/Mac dictionary lookup for Textfields.

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 5738887b7256d5c84e2aa333472fae50bc42ec25..56268375b4327229cfb06ac90070f268ef1e9673 100644
--- a/ui/views/controls/textfield/textfield_model.cc
+++ b/ui/views/controls/textfield/textfield_model.cc
@@ -616,12 +616,6 @@ void TextfieldModel::DeleteSelectionAndInsertTextAt(
                           position);
 }
 
-base::string16 TextfieldModel::GetTextFromRange(const gfx::Range& range) const {
-  if (range.IsValid() && range.GetMin() < text().length())
-    return text().substr(range.GetMin(), range.length());
-  return base::string16();
-}
-
 void TextfieldModel::GetTextRange(gfx::Range* range) const {
   *range = gfx::Range(0, text().length());
 }