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

content/browser/utility_process_host.h

Index: content/browser/utility_process_host.h
===================================================================
--- content/browser/utility_process_host.h	(revision 118420)
+++ content/browser/utility_process_host.h	(working copy)
@@ -12,10 +12,13 @@
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/process_util.h"
-#include "content/browser/browser_child_process_host.h"
 #include "content/common/content_export.h"
+#include "content/public/browser/browser_child_process_host_delegate.h"
 #include "content/public/browser/browser_thread.h"
+#include "ipc/ipc_message.h"
 
+class BrowserChildProcessHost;
+
 // This class acts as the browser-side host to a utility child process.  A
 // utility process is a short-lived sandboxed process that is created to run
 // a specific task.  This class lives solely on the IO thread.
@@ -23,7 +26,9 @@
 // If you need multiple batches of work to be done in the sandboxed process,
 // use StartBatchMode(), then multiple calls to StartFooBar(p),
 // then finish with EndBatchMode().
-class CONTENT_EXPORT UtilityProcessHost : public BrowserChildProcessHost {
+class CONTENT_EXPORT UtilityProcessHost
+    : public content::BrowserChildProcessHostDelegate,
+      public IPC::Message::Sender {
  public:
   // An interface to be implemented by consumers of the utility process to
   // get results back.  All functions are called on the thread passed along
@@ -53,7 +58,7 @@
                      content::BrowserThread::ID client_thread_id);
   virtual ~UtilityProcessHost();
 
-  // BrowserChildProcessHost override
+  // IPC::Message::Sender implementation:
   virtual bool Send(IPC::Message* message) OVERRIDE;
 
   // Starts utility process in batch mode. Caller must call EndBatchMode()
@@ -80,10 +85,8 @@
   // has already been started via StartBatchMode().
   bool StartProcess();
 
-  // IPC messages:
+  // BrowserChildProcessHost:
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
-
-  // BrowserChildProcessHost:
   virtual void OnProcessCrashed(int exit_code) OVERRIDE;
 
   // A pointer to our client interface, who will be informed of progress.
@@ -112,6 +115,8 @@
 
   bool started_;
 
+  scoped_ptr<BrowserChildProcessHost> process_;
+
   DISALLOW_COPY_AND_ASSIGN(UtilityProcessHost);
 };