Get more of the mac GN build working.

public/BUILD.gn

Index: public/BUILD.gn
diff --git a/public/BUILD.gn b/public/BUILD.gn
index 3dc23d4e5214d9cd5167c67f02852408104bb573..0fc665b7bfe6fdf8d754bb07350ae31c4fa5076c 100644
--- a/public/BUILD.gn
+++ b/public/BUILD.gn
@@ -46,6 +46,13 @@ group("all_blink") {
     "//third_party/WebKit/Source/web",
     "//third_party/WebKit/Source/wtf:wtf_unittests",
   ]
+  if (is_mac) {
+    # TODO(GYP): Re-enable this as soon as we can link Blink binaries on mac.
+    deps -= [
+      "//third_party/WebKit/Source/platform:heap_unittests",
+      "//third_party/WebKit/Source/platform:platform_unittests",
+    ]
+  }
 }
 
 config("blink_headers_config") {