Remove use_system_skia and skia_system.gypi

skia/skia.gyp

 # Copyright (c) 2012 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.
 
 {
   'conditions': [
     # In component mode (shared_lib), we build all of skia as a single DLL.
     # However, in the static mode, we need to build skia as multiple targets
     # in order to support the use case where a platform (e.g. Android) may
     # already have a copy of skia as a system library.
-    ['component=="static_library" and use_system_skia==0', {
+    ['component=="static_library"', {
       'targets': [
         {
           'target_name': 'skia_library',
           'type': 'static_library',
           'includes': [
             'skia_library.gypi',
             'skia_common.gypi',
             '../build/android/increase_size_for_speed.gypi',
             # Disable LTO due to compiler error
             # in mems_in_disjoint_alias_sets_p, at alias.c:393
             # crbug.com/422255
             '../build/android/disable_lto.gypi',
           ],
         },
       ],
     }],
-    ['component=="static_library" and use_system_skia==1', {
-      'targets': [
-        {
-          'target_name': 'skia_library',
-          'type': 'none',
-          'includes': [
-            'skia_system.gypi',
-            '../build/android/increase_size_for_speed.gypi',
-          ],
-        },
-      ],
-    }],
     ['component=="static_library"', {
       'targets': [
         {
           'target_name': 'skia',
           'type': 'none',
           'dependencies': [
             'skia_library',
             'skia_chrome',
           ],
           'export_dependent_settings': [
@@ skipping 104 matching lines @@
       ],
       'sources': [
         'tools/filter_fuzz_stub/filter_fuzz_stub.cc',
       ],
       'includes': [
         '../build/android/increase_size_for_speed.gypi',
       ],
     },
   ],
 }