Fix the `sizes` regressions in Linux GN.

extensions/renderer/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("//build/config/features.gni")
 import("//extensions/extensions.gni")
 
 assert(enable_extensions)
 
 # GYP version: extensions/extensions.gyp:extensions_renderer
-source_set("renderer") {
+static_library("renderer") {
+  # TODO(crbug.com/559766) this should be a source_set but
+  # there are static initializers that get accidentally linked
+  # into chrome from that need to be addressed first.
   sources = rebase_path(extensions_gypi_values.extensions_renderer_sources,
                         ".",
                         "//extensions")
 
   configs += [
     "//build/config:precompiled_headers",
 
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 
   deps = [
     "//chrome:resources",
     "//components/guest_view/renderer",
     "//content:resources",
     "//extensions:extensions_resources",
     "//gin",
     "//mojo/public/js",
     "//skia",
     "//third_party/WebKit/public:blink",
     "//third_party/mojo/src/mojo/edk/js",
   ]
 }