Fix !defined(SK_XML) builds

Add guards for dependent code.

TBR=
Change-Id: I49c0c90a2defc6f39589721f95562e9e0f17db13
Reviewed-on: https://skia-review.googlesource.com/144610
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>
diff --git a/BUILD.gn b/BUILD.gn
index 14173a0..ede8fc4 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -1674,15 +1674,17 @@
     ]
   }
 
-  test_app("create_test_font_color") {
-    sources = [
-      "tools/fonts/create_test_font_color.cpp",
-    ]
-    deps = [
-      ":flags",
-      ":skia",
-      ":tool_utils",
-    ]
+  if (skia_use_expat) {
+    test_app("create_test_font_color") {
+      sources = [
+        "tools/fonts/create_test_font_color.cpp",
+      ]
+      deps = [
+        ":flags",
+        ":skia",
+        ":tool_utils",
+      ]
+    }
   }
 
   test_app("get_images_from_skps") {