Remove GYP files in breakpad, build, and tools.

tools/imagediff/image_diff.gyp

-# Copyright (c) 2009 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': {
-    'chromium_code': 1,
-  },
-  'targets' : [
-    {
-      'target_name': 'image_diff',
-      'type': 'executable',
-      'variables': { 'enable_wexit_time_destructors': 1, },
-      'dependencies': [
-        '../../base/base.gyp:base',
-        '../../third_party/libpng/libpng.gyp:libpng',
-        '../../third_party/zlib/zlib.gyp:zlib',
-      ],
-      'include_dirs': [
-        '../../',
-      ],
-      'sources': [
-        'image_diff.cc',
-        'image_diff_png.h',
-        'image_diff_png.cc',
-      ],
-      'conditions': [
-       ['OS=="android"', {
-         # The Chromium Android port will compare images on host rather
-         # than target (a device or emulator) for performance reasons.
-         'toolsets': ['host'],
-       }],
-      ],
-    },
-  ],
-}