Update content/renderer:renderer public deps

content/renderer:renderer has public dependencies on content/common:mojo_bindings
but it had only been picking that up implicitly.

This has broken on the waterfall in the past. This adds it to the public deps.

Bug: 859324
Change-Id: I546280c175f3b857466f0f8de4b0aac64766acda
Reviewed-on: https://chromium-review.googlesource.com/1145715Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577227}

content/renderer/BUILD.gn

@@ -639,6 +639,7 @@ target(link_target_type, "renderer") {
   defines = []
 
   public_deps = [
+    "//content/common:mojo_bindings",
     "//content/public/common:common_sources",
     "//ipc",
   ]