Update existing uses of /wd4267 to use the GN config

gpu/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.
 
 # GYP version: gpu/blink/gpu_blink.gyp:gpu_blink
 component("blink") {
   output_name = "gpu_blink"
 
   sources = [
     "gpu_blink_export.h",
     "webgraphicscontext3d_impl.cc",
     "webgraphicscontext3d_impl.h",
     "webgraphicscontext3d_in_process_command_buffer_impl.cc",
     "webgraphicscontext3d_in_process_command_buffer_impl.h",
   ]
 
+  # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
+  configs += [ "//build/config/compiler:no_size_t_to_int_warning" ]
+
   defines = [ "GPU_BLINK_IMPLEMENTATION" ]
 
   deps = [
     "//base",
     "//base/third_party/dynamic_annotations",
     "//cc",
     "//gpu/command_buffer/common",
     "//gpu/command_buffer/service",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//gpu/command_buffer/client:gles2_implementation",
     "//gpu/command_buffer/client:gl_in_process_context",
     "//gpu/skia_bindings",
     "//skia",
     "//third_party/WebKit/public:blink_minimal",
     "//third_party/angle:translator",
     "//ui/gl",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
-
-  if (is_win) {
-    # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
-    cflags = [ "/wd4267" ]
-  }
 }