The root cause is the IsDebuggerPresent() disabled the debug message in vprintf_stderr_common() function.

/Thu May 17 20:04:23 PDT 2012/:

I enabled the debug output on Windows for WebCore, OutputDebugStringA is called 
to show the message. The output message can be displayed in Visual Studio 
Debugger, but DbgView only can see one debug message about the application name.

If I add one debug message in Page constructor, it can be captured by DbgView 
as below:
[6048] MiniBrowser.exe

It cannot work if I move the debug message in FrameLoader operations. I doubts 
the debug message was redirected after one special operation. Who knows detail 
about it?

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