GN: Make wtf_unittests build on mac/clang

Source/wtf/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.
 
 # The list of files is kept in the .gypi.
 gypi_values = exec_script("//build/gypi_to_gn.py",
                           [ rebase_path("wtf.gypi") ],
                           "scope",
                           [ "wtf.gypi" ])
 
@@ skipping 23 matching lines @@
       # implementations. Disable the warning for chromium windows multi-dll
       # build.
       cflags += [ "/wd4291" ]
     }
   }
 }
 
 component("wtf") {
   sources = gypi_values.wtf_files
 
+  configs += [
+    "//third_party/WebKit/Source:config",
+    "//third_party/WebKit/Source:non_test_config",
+  ]
+
   defines = [ "WTF_IMPLEMENTATION=1" ]
 
   direct_dependent_configs = [
     ":wtf_config",
-    "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:features",
   ]
 
   deps = [
     "//third_party/icu",
   ]
 
   forward_dependent_configs_from = [ "//third_party/icu" ]
 
   if (is_win) {
@@ skipping 32 matching lines @@
 test("wtf_unittests") {
   sources = gypi_values.wtf_unittest_files
 
   if (is_win) {
     cflags = [
       "/wd4068",  # Unknown pragma.
       "/wd4267",  # Conversion from 'size_t' to 'type',
     ]
   }
 
+  configs += [ "//third_party/WebKit/Source:config", ]
+
   deps = [
     ":run_all_tests",
     ":unittest_helpers",
     ":wtf",
     "//base",
     "//base/allocator",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }
 
 source_set("run_all_tests") {
   sources = [
     "testing/RunAllTests.cpp",
   ]
 
   configs += [
     ":wtf_config",
     "//third_party/WebKit/Source:config",
+    "//third_party/WebKit/Source:non_test_config",
   ]
 
   deps = [
     "//base/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }
 
 component("unittest_helpers") {
   sources = gypi_values.wtf_unittest_helper_files
   defines = [ "WTF_UNITTEST_HELPERS_IMPLEMENTATION=1" ]
 
+  configs += [
+    ":wtf_config",
+    "//third_party/WebKit/Source:config",
+    "//third_party/WebKit/Source:non_test_config",
+  ]
+
   deps = [
     ":wtf",
   ]
 }