Ensure that context menu->Print works in ChromeFrame.

chrome_frame/chrome_frame_activex_base.h

Index: chrome_frame/chrome_frame_activex_base.h
===================================================================
--- chrome_frame/chrome_frame_activex_base.h	(revision 86295)
+++ chrome_frame/chrome_frame_activex_base.h	(working copy)
@@ -24,6 +24,7 @@
 #include "base/win/scoped_comptr.h"
 #include "base/win/scoped_variant.h"
 #include "grit/chrome_frame_resources.h"
+#include "chrome/app/chrome_command_ids.h"
 #include "chrome/common/url_constants.h"
 #include "chrome_frame/chrome_frame_plugin.h"
 #include "chrome_frame/com_message_event.h"
@@ -352,6 +353,11 @@
           DoFileDownloadInIE(UTF8ToWide(url.spec()).c_str());
           return true;
         }
+
+        case IDC_PRINT: {
+          automation_client_->PrintTab();
+          break;
+        }
       }
     }