osmesa: drop workaround for VS2013 allocator shim

third_party/mesa/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/ui.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 
 config("mesa_headers_config") {
   include_dirs = [ "src/include" ]
@@ skipping 738 matching lines @@
     configs += [ "//build/config/win:no_incremental_linking" ]
   }
 
   deps = [
     ":mesa",
     ":mesa_headers",
     ":mesa_libglslcommon",
     "//build/config/sanitizers:deps",
   ]
 
-  # Required for the allocator implementation, which is not used on Mac.
-  if (!is_mac) {
-    deps += [ "//base" ]
-  }
-
   if (is_win) {
     defines = [
       "BUILD_GL32",
       "KEYWORD1=GLAPI",
       "KEYWORD2=GLAPIENTRY",
     ]
   }
 }
 
 if (is_linux) {
@@ skipping 11 matching lines @@
     deps = [
       "//third_party/wayland:wayland_util",
     ]
 
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ "//build/config/compiler:no_chromium_code" ]
 
     public_configs = [ ":wayland_drm_protocol_config" ]
   }
 }