GN: Simplify config by unconditionalising a flag that nacl-clang recognises

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 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/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/toolchain/ccache.gni")
 
 if (current_cpu == "arm") {
@@ skipping 1005 matching lines @@
 
     # Clang considers the `register` keyword as deprecated, but e.g.
     # code generated by flex (used in angle) contains that keyword.
     # http://crbug.com/255186
     "-Wno-deprecated-register",
 
     # TODO(thakis): This used to be implied by -Wno-unused-function,
     # which we no longer use. Check if it makes sense to remove
     # this as well. http://crbug.com/316352
     "-Wno-unneeded-internal-declaration",
+
+    # TODO(hans): Get this cleaned up, http://crbug.com/428099
+    "-Wno-inconsistent-missing-override",
   ]
 
   if (is_posix && !is_mac && !is_ios) {
     default_warning_flags += [
       # TODO(thakis): Remove, http://crbug.com/263960
       "-Wno-reserved-user-defined-literal",
     ]
   }
 
   # NaCl's Clang compiler and Chrome's hermetic Clang compiler will almost
   # always have different versions. Certain flags may not be recognized by
   # one version or the other.
   if (!is_nacl) {
     # Flags NaCl does not recognize.
     default_warning_flags += [
-      # TODO(hans): Get this cleaned up, http://crbug.com/428099
-      "-Wno-inconsistent-missing-override",
-
       # TODO(thakis): Enable this, crbug.com/507717
       "-Wno-shift-negative-value",
     ]
   }
 
   if (exec_script("//tools/clang/scripts/update.py",
                   [ "--print-revision" ],
                   "trim string") != "245965-1") {
     default_warning_flags += [
       # TODO(thakis): Move this into outer if once clang is rolled far enough
@@ skipping 433 matching lines @@
   } else if (symbol_level == 1) {
     cflags = minimal_symbols_cflags
     ldflags = minimal_symbols_ldflags
   } else if (symbol_level == 2) {
     cflags = symbols_cflags
     ldflags = symbols_ldflags
   } else {
     assert(false)
   }
 }