Reduce size of mojo AssociatedBinding template expansions

mojo/public/cpp/bindings/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 interfaces_bindings_gen_dir = "$root_gen_dir/mojo/public/interfaces/bindings"
 
 component("bindings") {
   sources = [
     # Normally, targets should depend on the source_sets generated by mojom
     # targets. However, the generated source_sets use portions of the bindings
@@ skipping 32 matching lines @@
     "interface_endpoint_client.h",
     "interface_endpoint_controller.h",
     "interface_id.h",
     "interface_ptr.h",
     "interface_ptr_info.h",
     "interface_ptr_set.h",
     "interface_request.h",
     "lib/array_internal.cc",
     "lib/array_internal.h",
     "lib/array_serialization.h",
+    "lib/associated_binding.cc",
     "lib/associated_group.cc",
     "lib/associated_group_controller.cc",
     "lib/associated_interface_ptr_state.h",
     "lib/binding_state.cc",
     "lib/binding_state.h",
     "lib/bindings_internal.h",
     "lib/buffer.h",
     "lib/clone_equals_util.h",
     "lib/connector.cc",
     "lib/control_message_handler.cc",
@@ skipping 114 matching lines @@
     ]
 
     public_deps = [
       ":bindings",
       "//third_party/WebKit/Source/wtf",
     ]
 
     public_configs = [ "//third_party/WebKit/Source:config" ]
   }
 }