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

ui/views/controls/textfield/textfield_model.h

Index: ui/views/controls/textfield/textfield_model.h
diff --git a/ui/views/controls/textfield/textfield_model.h b/ui/views/controls/textfield/textfield_model.h
index c66fe6d068083ee7047790207da919042160e663..cfc18afe75476a57349fbb9bded71cfc3153394c 100644
--- a/ui/views/controls/textfield/textfield_model.h
+++ b/ui/views/controls/textfield/textfield_model.h
@@ -205,7 +205,9 @@ class VIEWS_EXPORT TextfieldModel {
                                       size_t position);
 
   // Retrieves the text content in a given range.
-  base::string16 GetTextFromRange(const gfx::Range& range) const;
+  base::string16 GetTextFromRange(const gfx::Range& range) const {
+    return render_text_->GetTextFromRange(range);
+  }
 
   // Retrieves the range containing all text in the model.
   void GetTextRange(gfx::Range* range) const;