Revert of Add enable_ipc_logging build argument

ipc/BUILD.gn

Index: ipc/BUILD.gn
diff --git a/ipc/BUILD.gn b/ipc/BUILD.gn
index db839a3717421f677e107f287384eca5b2204c6a..16959fbaecb175d4ee670ca3923bbd50265354b3 100644
--- a/ipc/BUILD.gn
+++ b/ipc/BUILD.gn
@@ -2,22 +2,10 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/buildflag_header.gni")
 import("//build/config/nacl/config.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 import("//tools/ipc_fuzzer/ipc_fuzzer.gni")
-
-declare_args() {
-  # Enabling debug builds automatically sets enable_ipc_logging to true.
-  enable_ipc_logging = is_debug
-}
-
-buildflag_header("ipc_features") {
-  header = "ipc_features.h"
-
-  flags = [ "IPC_MESSAGE_LOG_ENABLED=$enable_ipc_logging" ]
-}
 
 component("ipc") {
   sources = [
@@ -110,7 +98,6 @@
   defines = [ "IPC_IMPLEMENTATION" ]
 
   public_deps = [
-    ":ipc_features",
     ":mojom",
     ":param_traits",
     "//mojo/public/cpp/bindings",