First round of dead file removal

experimental/hex/README

Index: experimental/hex/README
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-
-This directory contains Html, Javascript, and C++ files to implement the Hex
-Game (with AI) as a NativeClient application.
-
-The hex_12.cpp file is NOT part of the build.  This is the original
-AI/application that Cameron Browne posted on the web along with articles on the
-game of Hex.  It is provided here as a reference point for hex_maniac.cc.
-hex_manaic.cc is a copy of hex_12.cpp but with the changes necessary to be a
-NativeClient application.
-
-Key changes include:
-  - Not using stdin for input, but instead waiting for events to be sent from
-    the browser.
-  - Not having a main(), but instead having AppMain which is run as a separate
-    thread from the main thread that handles messages from the browser and sends
-    (posts) messages back.  The main thread/Native Client instance is defined in
-    hex_instance.h and hex_instance.cc.
-  - The output is still there.  This is useful in debugging on Linux, because
-    if you launch chrome from a terminal, then the text version of the game
-    state will be printed to the terminal, as well as other printf/cout
-    messages.