Remove DebuggerAgent.

tools/gyp/v8.gyp

 # Copyright 2012 the V8 project authors. 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
@@ skipping 295 matching lines @@
         '../../src/cpu-profiler.h',
         '../../src/cpu.cc',
         '../../src/cpu.h',
         '../../src/data-flow.cc',
         '../../src/data-flow.h',
         '../../src/date.cc',
         '../../src/date.h',
         '../../src/dateparser-inl.h',
         '../../src/dateparser.cc',
         '../../src/dateparser.h',
-        '../../src/debug-agent.cc',
-        '../../src/debug-agent.h',
         '../../src/debug.cc',
         '../../src/debug.h',
         '../../src/deoptimizer.cc',
         '../../src/deoptimizer.h',
         '../../src/disasm.h',
         '../../src/disassembler.cc',
         '../../src/disassembler.h',
         '../../src/diy-fp.cc',
         '../../src/diy-fp.h',
         '../../src/double.h',
@@ skipping 873 matching lines @@
         }],
         ['v8_compress_startup_data=="bz2"', {
           'libraries': [
             '-lbz2',
           ]
         }],
       ],
     },
   ],
 }