Remove blink dependencies from mojo_public_bindings_unittests on ios.

mojo/public/cpp/bindings/tests/BUILD.gn

Index: mojo/public/cpp/bindings/tests/BUILD.gn
diff --git a/mojo/public/cpp/bindings/tests/BUILD.gn b/mojo/public/cpp/bindings/tests/BUILD.gn
index 2e073a45050d964a051c64746cb85e28f3a2b44b..72095845ce043dcc9980aa7ae59c578f9c2519b7 100644
--- a/mojo/public/cpp/bindings/tests/BUILD.gn
+++ b/mojo/public/cpp/bindings/tests/BUILD.gn
@@ -59,6 +59,16 @@ source_set("tests") {
     "//mojo/public/interfaces/bindings/tests:test_struct_traits_interfaces",
     "//testing/gtest",
   ]
+
+  if (is_ios) {
+    sources -= [

[Nico, 2016/04/22 01:46:17]

in gn, we prefer to only add them if they're needed, instead of the
add-always-then-sometimes remove dance

[Sam McNally, 2016/04/22 01:57:43]

That's what I thought, but then I saw
https://chromium.googlesource.com/chromium/src/+/master/tools/gn/docs/cookboo....

+      "pickle_unittest.cc",
+      "struct_traits_unittest.cc",
+    ]
+
+    deps -= [ "//mojo/public/interfaces/bindings/tests:test_interfaces_wtf" ]
+    assert_no_deps = [ "//third_party/WebKit/*" ]
+  }
 }
 
 source_set("for_blink_tests") {