Remove root dir from protoc.gypi include paths.

webrtc/build/protoc.gypi

 # Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # Copied from Chromium's src/build/protoc.gypi
 #
 # It was necessary to copy this file to WebRTC, because the path to
 # build/common.gypi is different for the standalone and Chromium builds. Gyp
 # doesn't permit conditional inclusion or variable expansion in include paths.
 # http://code.google.com/p/gyp/wiki/InputFormatReference#Including_Other_Files
+#
+# Local changes:
+# * Removed <(DEPTH) from include_dir due to difficulties with generated
+#   downstream code.
+
 
 # This file is meant to be included into a target to provide a rule
 # to invoke protoc in a consistent manner. For Java-targets, see
 # protoc_java.gypi.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'my_proto_lib',
 #   'type': 'static_library',
 #   'sources': [
@@ skipping 79 matching lines @@
         '<(protoc)',
         '--cpp_out', '<(cc_generator_options)<(cc_dir)',
         '--python_out', '<(py_dir)',
       ],
       'message': 'Generating C++ and Python code from <(RULE_INPUT_PATH)',
       'process_outputs_as_sources': 1,
     },
   ],
   'include_dirs': [
     '<(SHARED_INTERMEDIATE_DIR)/protoc_out',
-    '<(DEPTH)',
   ],
   'direct_dependent_settings': {
     'include_dirs': [
       '<(SHARED_INTERMEDIATE_DIR)/protoc_out',
-      '<(DEPTH)',
     ]
   },
   # This target exports a hard dependency because it generates header
   # files.
   'hard_dependency': 1,
   'conditions': [
     ['build_protobuf==1', {
       'dependencies': [
         '<(DEPTH)/third_party/protobuf/protobuf.gyp:protoc#host',
         '<(DEPTH)/third_party/protobuf/protobuf.gyp:protobuf_lite',
       ],
       'export_dependent_settings': [
         # The generated headers reference headers within protobuf_lite,
         # so dependencies must be able to find those headers too.
         '<(DEPTH)/third_party/protobuf/protobuf.gyp:protobuf_lite',
       ],
     }],
   ],
 }