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

third_party/protobuf/examples/README.txt

-This directory contains example code that uses Protocol Buffers to manage an
-address book.  Two programs are provided, each with three different
-implementations, one written in each of C++, Java, and Python.  The add_person
-example adds a new person to an address book, prompting the user to input
-the person's information.  The list_people example lists people already in the
-address book.  The examples use the exact same format in all three languages,
-so you can, for example, use add_person_java to create an address book and then
-use list_people_python to read it.
-
-You must install the protobuf package before you can build these.
-
-To build all the examples (on a unix-like system), simply run "make".  This
-creates the following executable files in the current directory:
-  add_person_cpp     list_people_cpp
-  add_person_java    list_people_java
-  add_person_python  list_people_python
-
-If you only want to compile examples in one language, use "make cpp"*,
-"make java", or "make python".
-
-All of these programs simply take an address book file as their parameter.
-The add_person programs will create the file if it doesn't already exist.
-
-These examples are part of the Protocol Buffers tutorial, located at:
-  https://developers.google.com/protocol-buffers/docs/tutorials
-
-* Note that on some platforms you may have to edit the Makefile and remove
-"-lpthread" from the linker commands (perhaps replacing it with something else).
-We didn't do this automatically because we wanted to keep the example simple.