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

chrome/browser/tab_contents/tab_contents.cc

Index: chrome/browser/tab_contents/tab_contents.cc
diff --git a/chrome/browser/tab_contents/tab_contents.cc b/chrome/browser/tab_contents/tab_contents.cc
index cdc023d050f4d8ba3d10898ad48505f7063e9061..44bdae8191a8a4668749b32d879e05dab38992aa 100644
--- a/chrome/browser/tab_contents/tab_contents.cc
+++ b/chrome/browser/tab_contents/tab_contents.cc
@@ -1505,6 +1505,12 @@ int TabContents::GetZoomPercent(bool* enable_increment,
   return percent;
 }
 
+void TabContents::ViewSource()
+{
+  if (delegate_)
+    delegate_->ViewSourceForTab(this);
+}
+
 // Notifies the RenderWidgetHost instance about the fact that the page is
 // loading, or done loading and calls the base implementation.
 void TabContents::SetIsLoading(bool is_loading,