Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/python/README.txt

Index: third_party/protobuf/python/README.txt
diff --git a/third_party/protobuf/python/README.md b/third_party/protobuf/python/README.txt
similarity index 58%
rename from third_party/protobuf/python/README.md
rename to third_party/protobuf/python/README.txt
index 1b5b9dffd9a1ad209293b428197cbfad31269597..6dc144e9b817c50bab9e59a1c25b408a3e955c16 100644
--- a/third_party/protobuf/python/README.md
+++ b/third_party/protobuf/python/README.txt
@@ -1,8 +1,4 @@
 Protocol Buffers - Google's data interchange format
-===================================================
-
-[![Build Status](https://travis-ci.org/google/protobuf.svg?branch=master)](https://travis-ci.org/google/protobuf)
-
 Copyright 2008 Google Inc.
 
 This directory contains the Python Protocol Buffers runtime library.
@@ -10,7 +6,7 @@ This directory contains the Python Protocol Buffers runtime library.
 Normally, this directory comes as part of the protobuf package, available
 from:
 
-  https://developers.google.com/protocol-buffers/
+  http://code.google.com/p/protobuf
 
 The complete package includes the C++ source code, which includes the
 Protocol Compiler (protoc).  If you downloaded this package from PyPI
@@ -30,7 +26,7 @@ join the Protocol Buffers discussion list and let us know!
 Installation
 ============
 
-1) Make sure you have Python 2.6 or newer.  If in doubt, run:
+1) Make sure you have Python 2.4 or newer.  If in doubt, run:
 
      $ python -V
 
@@ -39,7 +35,7 @@ Installation
    If you would rather install it manually, you may do so by following
    the instructions on this page:
 
-     https://packaging.python.org/en/latest/installing.html#setup-for-installing-packages
+     http://peak.telecommunity.com/DevCenter/EasyInstall#installation-instructions
 
 3) Build the C++ code, or install a binary distribution of protoc.  If
    you install a binary distribution, make sure that it is the same
@@ -47,43 +43,10 @@ Installation
 
      $ protoc --version
 
-4) Build and run the tests:
+4) Run the tests:
 
-     $ python setup.py build
      $ python setup.py test
 
-     To build, test, and use the C++ implementation, you must first compile
-     libprotobuf.so:
-
-     $ (cd .. && make)
-
-     On OS X:
-
-      If you are running a homebrew-provided python, you must make sure another
-      version of protobuf is not already installed, as homebrew's python will
-      search /usr/local/lib for libprotobuf.so before it searches ../src/.libs
-      You can either unlink homebrew's protobuf or install the libprotobuf you
-      built earlier:
-
-      $ brew unlink protobuf
-      or
-      $ (cd .. && make install)
-
-     On other *nix:
-
-      You must make libprotobuf.so dynamically available. You can either
-      install libprotobuf you built earlier, or set LD_LIBRARY_PATH:
-
-      $ export LD_LIBRARY_PATH=../src/.libs
-      or
-      $ (cd .. && make install)
-
-     To build the C++ implementation run:
-     $ python setup.py build --cpp_implementation
-
-     Then run the tests like so:
-     $ python setup.py test --cpp_implementation
-
    If some tests fail, this library may not work correctly on your
    system.  Continue at your own risk.
 
@@ -97,17 +60,12 @@ Installation
 
 5) Install:
 
-    $ python setup.py install
-
-  or:
-
-    $ (cd .. && make install)
-    $ python setup.py install --cpp_implementation
+     $ python setup.py install
 
    This step may require superuser privileges.
-   NOTE: To use C++ implementation, you need to export an environment
-   variable before running your program.  See the "C++ Implementation"
-   section below for more details.
+   NOTE: To use C++ implementation, you need to install C++ protobuf runtime
+   library of the same version and export the environment variable before this
+   step. See the "C++ Implementation" section below for more details.
 
 Usage
 =====
@@ -115,11 +73,13 @@ Usage
 The complete documentation for Protocol Buffers is available via the
 web at:
 
-  https://developers.google.com/protocol-buffers/
+  http://code.google.com/apis/protocolbuffers/
 
 C++ Implementation
 ==================
 
+WARNING: This is EXPERIMENTAL and only available for CPython platforms.
+
 The C++ implementation for Python messages is built as a Python extension to
 improve the overall protobuf Python performance.
 
@@ -128,8 +88,13 @@ To use the C++ implementation, you need to:
    parent directory.
 2) Export an environment variable:
 
-    $ export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=cpp
+  $ export PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION=cpp
 
-You must set this variable at runtime, before running your program, otherwise
+You need to export this variable before running setup.py script to build and
+install the extension.  You must also set the variable at runtime, otherwise
 the pure-Python implementation will be used. In a future release, we will
 change the default so that C++ implementation is used whenever it is available.
+It is strongly recommended to run `python setup.py test` after setting the
+variable to "cpp", so the tests will be against C++ implemented Python
+messages.
+