Pepper: Remove unused ppapi.gypi file.

I came across this while trying to figure out how to make entry points work for
the trusted plugin. It's confusing to have these gypi variables around
when they're not used anywhere.

BUG=
R=bbudge@chromium.org

Review URL: https://codereview.chromium.org/405433006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283855 0039d316-1c4b-4281-b951-d872f2087c98

ppapi/ppapi.gypi

-# Copyright (c) 2010 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.
-
-{
-  'variables': {
-    #
-    # ppp_entrypoints_sources is a set of source files that provide
-    # a default implementation of plugin entry-points as defined in
-    # ppp.h. Note that these source files assume that plugin is dependent
-    # on ppapi_cpp_objects target defined in ppapi.gyp.
-    #
-    # Note that we cannot compile these source files into a static library
-    # because the entry points need to be exported from the plugin.
-    #
-    'ppp_entrypoints_sources': [
-      '<(DEPTH)/ppapi/cpp/module_embedder.h',
-      '<(DEPTH)/ppapi/cpp/ppp_entrypoints.cc',
-    ],
-  },
-}