View source after POST command isn't what you expected.

chrome/browser/tab_contents/render_view_context_menu.cc

 // Copyright (c) 2010 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.
 
 #include <algorithm>
 #include <set>
 
 #include "chrome/browser/tab_contents/render_view_context_menu.h"
 
 #include "app/l10n_util.h"
@@ skipping 1196 matching lines @@
       // Prevent the modal "Resubmit form post" dialog from appearing in the
       // context of an external context menu.
       source_tab_contents_->controller().Reload(!external_);
       break;
 
     case IDC_PRINT:
       source_tab_contents_->PrintPreview();
       break;
 
     case IDC_VIEW_SOURCE:
-      OpenURL(GURL(chrome::kViewSourceScheme + std::string(":") +
-          params_.page_url.spec()), NEW_FOREGROUND_TAB, PageTransition::LINK);
+      source_tab_contents_->ViewSource();
       break;
 
     case IDC_CONTENT_CONTEXT_INSPECTELEMENT:
       Inspect(params_.x, params_.y);
       break;
 
     case IDC_CONTENT_CONTEXT_VIEWPAGEINFO: {
       NavigationEntry* nav_entry =
           source_tab_contents_->controller().GetActiveEntry();
       source_tab_contents_->ShowPageInfo(nav_entry->url(), nav_entry->ssl(),
@@ skipping 231 matching lines @@
       profile_->GetPrefs()->GetString(prefs::kAcceptLanguages),
       g_browser_process->clipboard());
 }
 
 void RenderViewContextMenu::MediaPlayerActionAt(
     const gfx::Point& location,
     const WebMediaPlayerAction& action) {
   source_tab_contents_->render_view_host()->MediaPlayerActionAt(
       location, action);
 }