Remove section referring to content that no longer exists.

native_client_sdk/src/doc/devguide/devcycle/debugging.rst

 .. _devcycle-debugging:
 
 #########
 Debugging
 #########
 
 This document describes tools and techniques you can use to debug, monitor,
 and measure your application's performance.
 
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 development tools on your system, but when you're finished developing the
 plugin, you need to port it to Native Client (i.e., build the module with one
 of the toolchains in the NaCl SDK so that the module runs in Native Client).
 For details on this advanced development technique, see `Debugging a Trusted
 Plugin
 <http://www.chromium.org/nativeclient/how-tos/debugging-documentation/debugging-a-trusted-plugin>`_.
 Note that starting with the ``pepper_22`` bundle, the NaCl SDK for Windows
 includes pre-built libraries and library source code, making it much easier to
 build a module into a .DLL.
 
-Open source profiling tools
----------------------------
-
-For the brave-hearted there are open source tools at `Chromium.org
-<http://www.chromium.org/nativeclient>`_ that describe how to do profiling on
-`64-bit Windows
-<https://sites.google.com/a/chromium.org/dev/nativeclient/how-tos/profiling-nacl-apps-on-64-bit-windows>`_
-and `Linux
-<http://www.chromium.org/nativeclient/how-tos/limited-profiling-with-oprofile-on-x86-64>`_
-machines.
-
 
 .. |menu-icon| image:: /images/menu-icon.png
 .. |puzzle| image:: /images/puzzle.png