[Mac] Implement the system dictionary popup by implementing NSTextInput methods.

chrome/renderer/render_view.h

Index: chrome/renderer/render_view.h
diff --git a/chrome/renderer/render_view.h b/chrome/renderer/render_view.h
index dfbcf7d66629811d44764bd959fd42d628b8dd5a..96a9c4758926f362e19330ab89a6dcb62cc24a29 100644
--- a/chrome/renderer/render_view.h
+++ b/chrome/renderer/render_view.h
@@ -940,6 +940,9 @@ class RenderView : public RenderWidget,
   void OnWindowFrameChanged(const gfx::Rect& window_frame,
                             const gfx::Rect& view_frame);
   void OnSelectPopupMenuItem(int selected_index);
+  void OnCharacterIndexForPoint(gfx::Point point);
+  void OnFirstRectForCharacterRange(uint location, uint length);
+  void OnStringForRange(uint location, uint length);
 #endif
   void OnZoom(PageZoom::Function function);
   void OnJavaScriptStressTestControl(int cmd, int param);