Land prep work to enable NaCl in the Linux x64 GN builds.

chrome/common/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("//tools/grit/grit_rule.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../chrome_common.gypi") ],
                           "scope",
                           [ "../chrome_common.gypi" ])
@@ skipping 119 matching lines @@
                       ".",
                       "//chrome")
     }
   }
   if (is_mac) {
     sources +=
         rebase_path(gypi_values.chrome_common_mac_sources, ".", "//chrome")
   }
 
   if (enable_nacl) {
-    deps += [
-      #'<(DEPTH)/components/nacl.gyp:nacl_common',  TODO(GYP)
-    ]
+    deps += [ "//components/nacl:nacl_common" ]
   }
 
   # Printing.
   if (enable_basic_printing || enable_print_preview) {
     deps += [
       "//components/printing/common:printing_common",
       "//printing",
     ]
     if (enable_print_preview) {
       # Full printing support.
@@ skipping 124 matching lines @@
 
   deps = [
     ":make_chrome_version",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//components/bookmarks/common",
     "//third_party/widevine/cdm:version_h",
   ]
 
   if (enable_nacl) {
-    deps += [
-      #'../components/nacl.gyp:nacl_switches',  TODO(GYP)
-    ]
+    deps += [ "//components/nacl:nacl_switches" ]
   }
 }
 
 source_set("test_support") {
   testonly = true
   visibility = [ "//chrome/test:test_support" ]
 
   sources = []
 
   deps = [
@@ skipping 11 matching lines @@
     ]
   }
 
   if (enable_extensions) {
     sources += [
       "extensions/extension_test_util.cc",
       "extensions/extension_test_util.h",
     ]
   }
 }