Remove GYP files.

base/trace_event/etw_manifest/etw_manifest.gyp

-# Copyright 2015 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.
-{
-  'targets': [
-    {
-      # GN version: //base/trace_event/etw_manifest/BUILD.gn
-      'target_name': 'etw_manifest',
-      'type': 'none',
-      'toolsets': ['host', 'target'],
-      'hard_dependency': 1,
-      'conditions': [
-        ['OS=="win"', {
-          'sources': [
-            'chrome_events_win.man',
-          ],
-          'variables': {
-            'man_output_dir': '<(SHARED_INTERMEDIATE_DIR)/base/trace_event/etw_manifest',
-          },
-          'rules': [{
-            # Rule to run the message compiler.
-            'rule_name': 'message_compiler',
-            'extension': 'man',
-            'outputs': [
-              '<(man_output_dir)/chrome_events_win.h',
-              '<(man_output_dir)/chrome_events_win.rc',
-            ],
-            'action': [
-              'mc.exe',
-              '-h', '<(man_output_dir)',
-              '-r', '<(man_output_dir)/.',
-              '-um',
-              '<(RULE_INPUT_PATH)',
-            ],
-            'message': 'Running message compiler on <(RULE_INPUT_PATH)',
-          }],
-        }],
-      ],
-    }
-  ]
-}