Don't make classes derive from ChildProcessHost, and instead have them use it through composition...

chrome/browser/nacl_host/nacl_process_host.cc

Index: chrome/browser/nacl_host/nacl_process_host.cc
===================================================================
--- chrome/browser/nacl_host/nacl_process_host.cc	(revision 112597)
+++ chrome/browser/nacl_host/nacl_process_host.cc	(working copy)
@@ -23,6 +23,7 @@
 #include "chrome/common/nacl_messages.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/browser/renderer_host/chrome_render_message_filter.h"
+#include "content/common/child_process_host.h"
 #include "ipc/ipc_switches.h"
 #include "native_client/src/shared/imc/nacl_imc.h"
 
@@ -116,6 +117,21 @@
 }
 
 NaClProcessHost::~NaClProcessHost() {
+  int exit_code;
+  GetChildTerminationStatus(&exit_code);
+  std::string message =
+      base::StringPrintf("NaCl process exited with status %i (0x%x)",
+                         exit_code, exit_code);
+  if (exit_code == 0) {
+    LOG(INFO) << message;
+  } else {
+    LOG(ERROR) << message;
+  }
+
+#if defined(OS_WIN)
+  NaClBrokerService::GetInstance()->OnLoaderDied();
+#endif
+
   for (size_t i = 0; i < internal_->sockets_for_renderer.size(); i++) {
     if (nacl::Close(internal_->sockets_for_renderer[i]) != 0) {
       LOG(ERROR) << "nacl::Close() failed";
@@ -212,7 +228,7 @@
 }
 
 bool NaClProcessHost::LaunchSelLdr() {
-  if (!CreateChannel())
+  if (!child_process_host()->CreateChannel())
     return false;
 
   CommandLine::StringType nacl_loader_prefix;
@@ -232,12 +248,13 @@
   // http://code.google.com/p/nativeclient/issues/detail?id=2043.
   int flags = CHILD_NO_PIE;
 #elif defined(OS_LINUX)
-  int flags = nacl_loader_prefix.empty() ? CHILD_ALLOW_SELF : CHILD_NORMAL;
+  int flags = nacl_loader_prefix.empty() ? ChildProcessHost::CHILD_ALLOW_SELF :
+                                           ChildProcessHost::CHILD_NORMAL;
 #else
-  int flags = CHILD_NORMAL;
+  int flags = ChildProcessHost::CHILD_NORMAL;
 #endif
 
-  FilePath exe_path = GetChildPath(flags);
+  FilePath exe_path = ChildProcessHost::GetChildPath(flags);
   if (exe_path.empty())
     return false;
 
@@ -246,7 +263,8 @@
 
   cmd_line->AppendSwitchASCII(switches::kProcessType,
                               switches::kNaClLoaderProcess);
-  cmd_line->AppendSwitchASCII(switches::kProcessChannelID, channel_id());
+  cmd_line->AppendSwitchASCII(switches::kProcessChannelID,
+                              child_process_host()->channel_id());
   if (logging::DialogsAreSuppressed())
     cmd_line->AppendSwitch(switches::kNoErrorDialogs);
 
@@ -257,7 +275,7 @@
 #if defined(OS_WIN)
   if (RunningOnWOW64()) {
     return NaClBrokerService::GetInstance()->LaunchLoader(
-        this, ASCIIToWide(channel_id()));
+        this, ASCIIToWide(child_process_host()->channel_id()));
   } else {
     BrowserChildProcessHost::Launch(FilePath(), cmd_line);
   }
@@ -282,24 +300,6 @@
   return BrowserChildProcessHost::GetChildTerminationStatus(exit_code);
 }
 
-void NaClProcessHost::OnChildDied() {
-  int exit_code;
-  GetChildTerminationStatus(&exit_code);
-  std::string message =
-    base::StringPrintf("NaCl process exited with status %i (0x%x)",
-                       exit_code, exit_code);
-  if (exit_code == 0) {
-    LOG(INFO) << message;
-  } else {
-    LOG(ERROR) << message;
-  }
-
-#if defined(OS_WIN)
-  NaClBrokerService::GetInstance()->OnLoaderDied();
-#endif
-  BrowserChildProcessHost::OnChildDied();
-}
-
 // This only ever runs on the BrowserThread::FILE thread.
 // If multiple tasks are posted, the later ones are no-ops.
 void NaClBrowser::OpenIrtLibraryFile() {
@@ -519,7 +519,3 @@
   NOTREACHED() << "Invalid message with type = " << msg.type();
   return false;
 }
-
-bool NaClProcessHost::CanShutdown() {
-  return true;
-}