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

content/browser/plugin_data_remover_impl.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/browser/plugin_data_remover_impl.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/version.h"
 #include "content/browser/plugin_process_host.h"
 #include "content/browser/plugin_service.h"
+#include "content/common/child_process_host.h"
 #include "content/common/plugin_messages.h"
 #include "content/public/browser/browser_thread.h"
 #include "webkit/plugins/npapi/plugin_group.h"
 
 using content::BrowserThread;
 
 namespace {
 
 const char kFlashMimeType[] = "application/x-shockwave-flash";
 // The minimum Flash Player version that implements NPP_ClearSiteData.
@@ skipping 207 matching lines @@
 
 PluginDataRemoverImpl::~PluginDataRemoverImpl() {
 }
 
 base::WaitableEvent* PluginDataRemoverImpl::StartRemoving(
     base::Time begin_time) {
   DCHECK(!context_.get());
   context_ = new Context(mime_type_, begin_time, resource_context_);
   return context_->event();
 }