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

ui/views/controls/textfield/textfield.h

Index: ui/views/controls/textfield/textfield.h
diff --git a/ui/views/controls/textfield/textfield.h b/ui/views/controls/textfield/textfield.h
index 22ff37b869acab431c7710407f0566326106d93e..4352be862d2073b35a4720de1964461e4bad2816 100644
--- a/ui/views/controls/textfield/textfield.h
+++ b/ui/views/controls/textfield/textfield.h
@@ -207,6 +207,7 @@ class VIEWS_EXPORT Textfield : public View,
   int GetBaseline() const override;
   gfx::Size GetPreferredSize() const override;
   const char* GetClassName() const override;
+  gfx::RenderText* GetRenderText() const override;
   gfx::NativeCursor GetCursor(const ui::MouseEvent& event) override;
   bool OnMousePressed(const ui::MouseEvent& event) override;
   bool OnMouseDragged(const ui::MouseEvent& event) override;
@@ -306,9 +307,6 @@ class VIEWS_EXPORT Textfield : public View,
   // Inserts or appends a character in response to an IME operation.
   virtual void DoInsertChar(base::char16 ch);
 
-  // Returns the TextfieldModel's text/cursor/selection rendering model.
-  gfx::RenderText* GetRenderText() const;
-
   gfx::Point last_click_location() const { return last_click_location_; }
 
   // Get the text from the selection clipboard.