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

content/browser/renderer_host/render_view_host.cc

Index: content/browser/renderer_host/render_view_host.cc
diff --git a/content/browser/renderer_host/render_view_host.cc b/content/browser/renderer_host/render_view_host.cc
index 58d3768f172feb7b8176c1d0200e0e3a057e698b..ad7d7c16bff4172e13ebb9bed08c1a66c7b96bbf 100644
--- a/content/browser/renderer_host/render_view_host.cc
+++ b/content/browser/renderer_host/render_view_host.cc
@@ -1207,9 +1207,11 @@ void RenderViewHost::OnMsgSetTooltipText(
     view()->SetTooltipText(wrapped_tooltip_text);
 }
 
-void RenderViewHost::OnMsgSelectionChanged(const std::string& text) {
+void RenderViewHost::OnMsgSelectionChanged(const std::string& text,
+                                           int start,
+                                           int end) {
   if (view())
-    view()->SelectionChanged(text);
+    view()->SelectionChanged(text, start, end);
 }
 
 void RenderViewHost::OnMsgRunJavaScriptMessage(