GN: Add quotes when setting BUILD_ID from android_chrome_build_id

chrome/browser/ui/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/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("../../chrome_browser_ui.gypi") ],
@@ skipping 306 matching lines @@
                            ".",
                            "//chrome")
   }
 
   if (is_android) {
     deps += [
       "//chrome/browser:jni_headers",
       "//crypto:platform",
     ]
 
-    defines += [ "CHROME_BUILD_ID=" + android_chrome_build_id ]
+    defines += [ "CHROME_BUILD_ID=\"$android_chrome_build_id\"" ]
 
     if (!use_aura) {
       sources +=
           rebase_path(gypi_values.chrome_browser_ui_android_non_aura_sources,
                       ".",
                       "//chrome")
       deps += [ "//components/web_contents_delegate_android" ]
       deps -= [ "//ui/events" ]
     }
   }
@@ skipping 252 matching lines @@
     "//chrome/browser",
     "//content/public/browser",
     "//content/public/common",
     "//content/test:test_support",
     "//net:test_support",
     "//skia",
     "//testing/gtest",
     "//ui/base",
   ]
 }