Remove directories in mojo/public/third_party that just mirrored third_party.

mojo/public/third_party/ply/LICENSE

Index: mojo/public/third_party/ply/LICENSE
diff --git a/mojo/public/third_party/ply/LICENSE b/mojo/public/third_party/ply/LICENSE
deleted file mode 100644
index b2738663454bd3706663009068f1790b3a3de736..0000000000000000000000000000000000000000
--- a/mojo/public/third_party/ply/LICENSE
+++ /dev/null
@@ -1,30 +0,0 @@
-PLY (Python Lex-Yacc)                   Version 3.4
-
-Copyright (C) 2001-2011,
-David M. Beazley (Dabeaz LLC)
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-* Redistributions of source code must retain the above copyright notice,
-  this list of conditions and the following disclaimer.  
-* Redistributions in binary form must reproduce the above copyright notice, 
-  this list of conditions and the following disclaimer in the documentation
-  and/or other materials provided with the distribution.  
-* Neither the name of the David Beazley or Dabeaz LLC may be used to
-  endorse or promote products derived from this software without
-  specific prior written permission. 
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.