mojo::Callback -> base::Callback

mojo/public/cpp/bindings/BUILD.gn

Index: mojo/public/cpp/bindings/BUILD.gn
diff --git a/mojo/public/cpp/bindings/BUILD.gn b/mojo/public/cpp/bindings/BUILD.gn
index 4a9bf4effcda6f01845b63ace26c502a8d4d72ed..23f92455e87a611c3edcd3493f20e170daaa7b66 100644
--- a/mojo/public/cpp/bindings/BUILD.gn
+++ b/mojo/public/cpp/bindings/BUILD.gn
@@ -84,6 +84,7 @@ source_set("bindings") {
     "lib/sync_handle_registry.cc",
     "lib/sync_handle_watcher.cc",
     "lib/sync_handle_watcher.h",
+    "lib/template_util.h",
     "lib/union_accessor.h",
     "lib/validate_params.h",
     "lib/validation_context.cc",
@@ -132,15 +133,10 @@ source_set("bindings") {
 source_set("callback") {
   sources = [
     "callback.h",
-    "lib/callback_internal.h",
-    "lib/shared_data.h",
-    "lib/shared_ptr.h",
-    "lib/template_util.h",
   ]
 
-  deps = [
+  public_deps = [
     "//base",
-    "//mojo/public/cpp/system",
   ]
 }