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

chrome/browser/renderer_host/render_view_host.cc

Index: chrome/browser/renderer_host/render_view_host.cc
diff --git a/chrome/browser/renderer_host/render_view_host.cc b/chrome/browser/renderer_host/render_view_host.cc
index e3cc83e68e0c91f86045091f4b1edda2043e33fa..2a863cba13bf40e770a17865f86360d05642ae1d 100644
--- a/chrome/browser/renderer_host/render_view_host.cc
+++ b/chrome/browser/renderer_host/render_view_host.cc
@@ -1211,9 +1211,11 @@ 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(