Reland "Add enable_ipc_logging build argument"

content/browser/browser_ipc_logging.cc

 // Copyright (c) 2011 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.
 
 #include "content/public/browser/browser_ipc_logging.h"
 
 #include "base/bind.h"
 #include "content/common/child_process_messages.h"
 #include "content/public/browser/browser_child_process_host_iterator.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_process_host.h"
 #include "ipc/ipc_logging.h"
 
 namespace content {
 
-#if defined(IPC_MESSAGE_LOG_ENABLED)
+#if BUILDFLAG(IPC_MESSAGE_LOG_ENABLED)
 
 void EnableIPCLoggingForChildProcesses(bool enabled) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   BrowserChildProcessHostIterator i;  // default constr references a singleton
   while (!i.Done()) {
     i.Send(new ChildProcessMsg_SetIPCLoggingEnabled(enabled));
     ++i;
   }
 }
@@ skipping 12 matching lines @@
       FROM_HERE,
       base::Bind(EnableIPCLoggingForChildProcesses, enable));
 
   // Finally, tell the renderers which don't derive from ChildProcess.
   // Messages to the renderers must be done on the UI (main) thread.
   for (RenderProcessHost::iterator i(RenderProcessHost::AllHostsIterator());
        !i.IsAtEnd(); i.Advance())
     i.GetCurrentValue()->Send(new ChildProcessMsg_SetIPCLoggingEnabled(enable));
 }
 
-#endif  // IPC_MESSAGE_LOG_ENABLED
+#endif  // BUILDFLAG(IPC_MESSAGE_LOG_ENABLED)
 
 }  // namespace content