Remove unused class WebNinePatchLayerImpl.

cc/blink/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.
 
 import("//testing/test.gni")
 
 # GYP version: //cc/blink/cc_blink.gyp:cc_blink
 component("blink") {
   output_name = "cc_blink"
 
@@ skipping 25 matching lines @@
     "web_filter_operations_impl.cc",
     "web_filter_operations_impl.h",
     "web_float_animation_curve_impl.cc",
     "web_float_animation_curve_impl.h",
     "web_image_layer_impl.cc",
     "web_image_layer_impl.h",
     "web_layer_impl.cc",
     "web_layer_impl.h",
     "web_layer_impl_fixed_bounds.cc",
     "web_layer_impl_fixed_bounds.h",
-    "web_nine_patch_layer_impl.cc",
-    "web_nine_patch_layer_impl.h",
     "web_scroll_offset_animation_curve_impl.cc",
     "web_scroll_offset_animation_curve_impl.h",
     "web_scrollbar_layer_impl.cc",
     "web_scrollbar_layer_impl.h",
     "web_to_cc_animation_delegate_adapter.cc",
     "web_to_cc_animation_delegate_adapter.h",
     "web_transform_animation_curve_impl.cc",
     "web_transform_animation_curve_impl.h",
     "web_transform_operations_impl.cc",
     "web_transform_operations_impl.h",
@@ skipping 37 matching lines @@
       "//skia",
       "//testing/gtest",
       "//third_party/WebKit/public:blink",
       "//ui/gfx/geometry",
       "//ui/gfx:test_support",
       "//cc",
       "//cc:test_support",
     ]
   }
 }