Handle the print context menu on ChromeFrame fully. Currently we handle it in both places.

chrome_frame/chrome_frame_activex_base.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_FRAME_CHROME_FRAME_ACTIVEX_BASE_H_
 #define CHROME_FRAME_CHROME_FRAME_ACTIVEX_BASE_H_
 
 #include <atlbase.h>
 #include <atlcom.h>
 #include <atlctl.h>
@@ skipping 339 matching lines @@
         case IDS_CONTENT_CONTEXT_SAVEIMAGEAS:
         case IDS_CONTENT_CONTEXT_SAVELINKAS: {
           GURL referrer, url;
           chrome_frame::GetMiniContextMenuData(cmd, params, &referrer, &url);
           DoFileDownloadInIE(UTF8ToWide(url.spec()).c_str());
           return true;
         }
 
         case IDC_PRINT: {
           automation_client_->PrintTab();
-          break;
+          return true;
         }
       }
     }
 
     return false;
   }
 
   // Should connections initiated by this class try to block
   // responses served with the X-Frame-Options header?
   // ActiveX controls genereally will want to do this,
@@ skipping 849 matching lines @@
   EventHandlers onreadystatechanged_;
   EventHandlers onprivatemessage_;
   EventHandlers onextensionready_;
 
   // Handle network requests when host network stack is used. Passed to the
   // automation client on initialization.
   scoped_ptr<UrlmonUrlRequestManager> url_fetcher_;
 };
 
 #endif  // CHROME_FRAME_CHROME_FRAME_ACTIVEX_BASE_H_