GN: Make wtf_unittests build on mac/clang

Source/platform/BUILD.gn

Index: Source/platform/BUILD.gn
diff --git a/Source/platform/BUILD.gn b/Source/platform/BUILD.gn
index e38421979651e3dfce46c907900133a4f766b346..180f26d108993c90427f3aae19e309d3126ef773 100644
--- a/Source/platform/BUILD.gn
+++ b/Source/platform/BUILD.gn
@@ -36,6 +36,7 @@ component("blink_common") {
   configs += [
     "//build/config/compiler:wexit_time_destructors",
     "//third_party/WebKit/Source:config",
+    "//third_party/WebKit/Source:non_test_config",
   ]
 
   deps = [
@@ -169,6 +170,7 @@ component("platform") {
   configs += [
     ":v8_stub_config",
     "//third_party/WebKit/Source:config",
+    "//third_party/WebKit/Source:non_test_config",
   ]
 
   defines = [
@@ -269,12 +271,6 @@ component("platform") {
     ]
   }
 
-  if (!(is_linux || is_android)) {
-    sources -= [
-      "fonts/linux/FontPlatformDataLinuxHarfBuzz.cpp",
-    ]
-  }
-
   if (is_win) {
     sources -= [
       # Uses LocaleWin instead.