mac/gn: Add most missing test binaries to the gn build.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 5e9ba95ee6764ee21c65f271f0a1eb1dfcf97e07..651e349898942bdc2fa4d52cc74cc12238ae2414 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -432,7 +432,9 @@ group("both_gn_and_gyp") {
     ]
   }
 
-  if (is_android || is_win || (is_linux && !is_chromeos)) {
+  # TODO(GYP): Figure out which of these should (and can) build
+  # for chromeos/ios.
+  if (!is_chromeos && !is_ios) {
     deps += [
       "//base:build_utf8_validator_tables",
       "//base:check_example",
@@ -455,8 +457,6 @@ group("both_gn_and_gyp") {
       "//ui/compositor:compositor_unittests",
     ]
 
-    # TODO(GYP): Figure out which of these should (and can) build
-    # for chromeos/mac/ios.
     if (!is_android) {
       deps += [
         "//chrome/test:load_library_perf_tests",