Add a Content API around BrowserChildProcessHost, similar to what was done with ChildProcessHost....

content/browser/content_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/content_ipc_logging.h"
 
 #include "base/bind.h"
 #include "content/browser/browser_child_process_host.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)
 
 void EnableIPCLoggingForChildProcesses(bool enabled) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
-  BrowserChildProcessHost::Iterator i;  // default constr references a singleton
+  BrowserChildProcessHostIterator i;  // default constr references a singleton
   while (!i.Done()) {
-    i->Send(new ChildProcessMsg_SetIPCLoggingEnabled(enabled));
+    i.Send(new ChildProcessMsg_SetIPCLoggingEnabled(enabled));
     ++i;
   }
 }
 
 void EnableIPCLogging(bool enable) {
   // First enable myself.
   if (enable)
     IPC::Logging::GetInstance()->Enable();
   else
     IPC::Logging::GetInstance()->Disable();
 
   // Now tell subprocesses.  Messages to ChildProcess-derived
   // processes must be done on the IO thread.
   BrowserThread::PostTask(
       BrowserThread::IO,
       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
 
 }  // namespace content