Add blimp to root GN check_targets

blimp/net/BUILD.gn

 # Copyright 2015 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("blimp_net") {
   sources = [
     "blimp_connection.cc",
     "blimp_connection.h",
     "blimp_message_checkpoint_observer.h",
     "blimp_message_checkpointer.cc",
@@ skipping 51 matching lines @@
     "thread_pipe_manager.h",
   ]
 
   defines = [ "BLIMP_NET_IMPLEMENTATION=1" ]
 
   deps = [
     "//base",
     "//blimp/common:blimp_common",
     "//blimp/common/proto",
     "//net",
+    "//third_party/WebKit/public:blink_headers",
     "//third_party/zlib",
     "//ui/base/ime:text_input_types",
   ]
 }
 
 source_set("test_support") {
   testonly = true
 
   sources = [
     "test_common.cc",
@@ skipping 36 matching lines @@
     ":blimp_net",
     ":test_support",
     "//base",
     "//base/test:run_all_unittests",
     "//base/test:test_support",
     "//blimp/common:blimp_common",
     "//blimp/common/proto",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
+    "//third_party/WebKit/public:blink_headers",
   ]
 }