Remove GYP files.

third_party/leakcanary/leakcanary.gyp

Index: third_party/leakcanary/leakcanary.gyp
diff --git a/third_party/leakcanary/leakcanary.gyp b/third_party/leakcanary/leakcanary.gyp
deleted file mode 100644
index eb143e781e7a805057eb6d3b609737cf02325313..0000000000000000000000000000000000000000
--- a/third_party/leakcanary/leakcanary.gyp
+++ /dev/null
@@ -1,18 +0,0 @@
-# Copyright 2016 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': [
-    {
-      # Leak Canary added to GN only.
-      'target_name': 'leakcanary_java',
-      'type': 'none',
-      'variables': {
-        'java_in_dir': 'src/leakcanary-android-no-op/src/main',
-        'java_in_dir_suffix': '/java',
-      },
-      'includes': [ '../../build/java.gypi' ],
-    },
-  ],
-}