media: Support MojoRendererService in the browser process.

content/renderer/BUILD.gn

Index: content/renderer/BUILD.gn
diff --git a/content/renderer/BUILD.gn b/content/renderer/BUILD.gn
index 664d9d40002cb4084f5fe1fe5b45749301373680..4f5ffd5c3a57c64fdf095fa9868662efd00eb1e5 100644
--- a/content/renderer/BUILD.gn
+++ b/content/renderer/BUILD.gn
@@ -187,4 +187,8 @@ source_set("renderer") {
       "media/crypto/renderer_cdm_manager.h",
     ]
   }
+
+  if (enable_media_mojo_renderer) {
+    deps += [ "//media/mojo/services:renderer_proxy" ]
+  }
 }