mojo: make bindings_base rather than bindings depend on mojo_features.

TBR=rockot@chromium.org

No-Tree-Checks: true
No-Try: true
Bug: 820407
Change-Id: Ib10cd0c33aa8ad1725c22e180aa679352cd8883d
Reviewed-on: https://chromium-review.googlesource.com/957462
Commit-Queue: John Budorick <jbudorick@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542214}

mojo/public/cpp/bindings/BUILD.gn

@@ -88,6 +88,7 @@ component("bindings_base") {
   defines = [ "IS_MOJO_CPP_BINDINGS_BASE_IMPL" ]
 
   public_deps = [
+    ":mojo_features",
     "//base",
     "//mojo/public/cpp/system",
   ]
@@ -160,7 +161,6 @@ component("bindings") {
 
   public_deps = [
     ":bindings_base",
-    ":mojo_features",
     ":struct_traits",
     "//base",
     "//ipc:message_support",