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 a89c3cc99aa9ae0d48a321b85faef35ef54e74a0..ff70d8ef5d5ead1f4c094b69a13cecc76959ee9c 100644
--- a/ui/views/controls/textfield/textfield_model.cc
+++ b/ui/views/controls/textfield/textfield_model.cc
@@ -623,12 +623,6 @@ 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());
 }