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

chrome/browser/tab_contents/tab_contents.h

 // 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.
 
 #ifndef CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 #pragma once
 
 #include <deque>
 #include <map>
@@ skipping 709 matching lines @@
   // Sends the page title to the history service. This is called when we receive
   // the page title and we know we want to update history.
   void UpdateHistoryPageTitle(const NavigationEntry& entry);
 
   // Gets the zoom level for this tab.
   double GetZoomLevel() const;
 
   // Gets the zoom percent for this tab.
   int GetZoomPercent(bool* enable_increment, bool* enable_decrement);
 
+  // Opens view-source tab for this contents.
+  void ViewSource();
+
   // Gets the minimum/maximum zoom percent.
   int minimum_zoom_percent() const { return minimum_zoom_percent_; }
   int maximum_zoom_percent() const { return maximum_zoom_percent_; }
 
   int content_restrictions() const { return content_restrictions_; }
 
  private:
   friend class NavigationController;
   // Used to access the child_windows_ (ConstrainedWindowList) for testing
   // automation purposes.
@@ skipping 585 matching lines @@
   // Content restrictions, used to disable print/copy etc based on content's
   // (full-page plugins for now only) permissions.
   int content_restrictions_;
 
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_