This CL makes the TranslationService class send the text to be translated to ...

chrome/browser/renderer_host/render_view_host.cc

Index: chrome/browser/renderer_host/render_view_host.cc
===================================================================
--- chrome/browser/renderer_host/render_view_host.cc	(revision 37411)
+++ chrome/browser/renderer_host/render_view_host.cc	(working copy)
@@ -1747,6 +1747,13 @@
   Send(new ViewMsg_CustomContextMenuAction(routing_id(), action));
 }
 
+void RenderViewHost::TranslatePage(int page_id,
+                                   const std::string& source_lang,
+                                   const std::string& target_lang) {
+  Send(new ViewMsg_TranslatePage(routing_id(), page_id,
+                                 source_lang, target_lang));
+}
+
 void RenderViewHost::OnExtensionPostMessage(
     int port_id, const std::string& message) {
   if (process()->profile()->GetExtensionMessageService()) {