Fix gn check errors for cc/blink

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 76 matching lines @@
       "test/cc_blink_test_suite.cc",
       "test/run_all_unittests.cc",
     ]
 
     deps = [
       ":blink",
       "//base/test:test_support",
       "//base/third_party/dynamic_annotations",
       "//skia",
       "//testing/gtest",
+      "//third_party/WebKit/public:blink",
       "//ui/gfx/geometry",
       "//ui/gfx:test_support",
       "//cc",
       "//cc:test_support",
     ]
   }
 }