Cleanup webkit_child target and dependencies on it.

webkit/child/BUILD.gn

 # Copyright 2014 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.
 
 component("child") {
   output_name = "webkit_child"
   sources = [
     "resource_loader_bridge.cc",
     "resource_loader_bridge.h",
     "webkit_child_export.h",
   ]
 
   defines = [ "WEBKIT_CHILD_IMPLEMENTATION" ]
-  include_dirs = [
-    # For JNI generated header.
-    "$root_gen_dir/webkit",
-  ]
-
-  configs += [ "//build/config/compiler:wexit_time_destructors" ]
-  if (is_win) {
-    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    cflags = [ "/wd4267" ]
-  }
-
-  if (is_mac) {
-    libs = [ "QuartzCore.framework" ]
-  }
-  if (is_android) {
-    #deps += [ ":overscroller_jni_headers" ]  TODO(GYP)
-  }
 
   deps = [
     "//base",
-    "//base:i18n",
-    "//base/third_party/dynamic_annotations",
     "//net",
-    "//skia",
-    "//third_party/WebKit/public:blink",
-    "//ui/gfx",
-    "//ui/gfx/geometry",
-    "//ui/native_theme",
-    "//url",
-    "//v8",
-    "//webkit/common",
   ]
 }
-
-#TODO(GYP)
-#'target_name': 'overscroller_jni_headers',
-#'type': 'none',
-#'variables': {
-#  'jni_gen_package': 'webkit',
-#  'input_java_class': 'android/widget/OverScroller.class',
-#},
-#'includes': [ '../../build/jar_file_jni_generator.gypi' ],
-