//third_party/WebKit/Source/core: include v8 as a user, not system, header

third_party/WebKit/Source/core/plugins/BUILD.gn

 # Copyright 2016 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.
 
 # This currently is here just to hold the header file. If this starts compiling
 # source, this target should be changed to a blink_core_sources type.
 source_set("plugins") {
   sources = [
     "PluginView.h",
   ]
+  deps = [
+    "//v8",
+  ]
 }