Remove PPAPI gyp files.

ppapi/ppapi.gyp

-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# This is the "public" ppapi.gyp file, which must have dependencies on the
-# redistributable portions of PPAPI only. This prevents circular dependencies
-# in the .gyp files (since ppapi_internal depends on parts of Chrome).
-
-{
-  'variables': {
-    'chromium_code': 1,  # Use higher warning level.
-  },
-  'target_defaults': {
-    'conditions': [
-      # Linux shared libraries should always be built -fPIC.
-      #
-      # TODO(ajwong): For internal pepper plugins, which are statically linked
-      # into chrome, do we want to build w/o -fPIC?  If so, how can we express
-      # that in the build system?
-      ['os_posix == 1 and OS != "mac" and OS != "android"', {
-        'cflags': ['-fPIC', '-fvisibility=hidden'],
-
-        # This is needed to make the Linux shlib build happy. Without this,
-        # -fvisibility=hidden gets stripped by the exclusion in common.gypi
-        # that is triggered when a shared library build is specified.
-        'cflags/': [['include', '^-fvisibility=hidden$']],
-      }],
-    ],
-  },
-  'includes': [
-    'ppapi_sources.gypi',
-    'ppapi_cpp.gypi',
-    'ppapi_gl.gypi',
-  ],
-}