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

content/renderer/render_widget_fullscreen_pepper.cc

Index: content/renderer/render_widget_fullscreen_pepper.cc
diff --git a/content/renderer/render_widget_fullscreen_pepper.cc b/content/renderer/render_widget_fullscreen_pepper.cc
index d2ab7342b7ef2275c607df5fbd3a9e2c0cdb346a..ae8aeb754a2027811c007cc590ce0dc74fabb8e3 100644
--- a/content/renderer/render_widget_fullscreen_pepper.cc
+++ b/content/renderer/render_widget_fullscreen_pepper.cc
@@ -161,10 +161,6 @@ class PepperWidget : public WebWidget {
     return false;
   }
 
-  virtual bool selectionRange(size_t *location, size_t *length) {
-    return false;
-  }
-
   virtual bool caretOrSelectionRange(size_t* location, size_t* length) {
     return false;
   }