[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 76117476232260a597d643b0de685a9e7ccec54d..86894192baaa13ce2db5b6307dd4cf4442515d6a 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(