3rd try. *sigh*...

chrome_frame/delete_chrome_history.h

+// Copyright (c) 2010 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.
+
+#ifndef CHROME_FRAME_DELETE_CHROME_HISTORY_H_
+#define CHROME_FRAME_DELETE_CHROME_HISTORY_H_
+
+#include <atlbase.h>
+#include <atlwin.h>
+#include <atlcom.h>
+
+#include <deletebrowsinghistory.h>
+
+#include "base/message_loop.h"
+#include "chrome_frame/bho.h"
+#include "chrome_frame/chrome_frame_plugin.h"
+#include "grit/chrome_frame_resources.h"
+
+// Include without path to make GYP build see it.
+#include "chrome_tab.h"  // NOLINT
+
+class Bho;
+
+// DeleteChromeHistory: Implements IDeleteBrowsingHistory and
+// pumps cache clearing operations over automation. Blocks the UI
+// thread while operating.  You have been warned.
+class ATL_NO_VTABLE DeleteChromeHistory
+    : public CComTearOffObjectBase<Bho, CComSingleThreadModel>,
+      public CWindowImpl<DeleteChromeHistory>,
+      public ChromeFramePlugin<DeleteChromeHistory>,
+      public IDeleteBrowsingHistory {
+ public:
+  DeleteChromeHistory();
+  ~DeleteChromeHistory();
+
+  HRESULT FinalConstruct();
+
+DECLARE_CLASSFACTORY_SINGLETON(DeleteChromeHistory)
+
+BEGIN_COM_MAP(DeleteChromeHistory)
+  COM_INTERFACE_ENTRY(IDeleteBrowsingHistory)
+END_COM_MAP()
+
+BEGIN_MSG_MAP(DeleteChromeHistory)
+  CHAIN_MSG_MAP(ChromeFramePlugin<DeleteChromeHistory>)
+END_MSG_MAP()
+
+  // IDeleteBrowsingHistory methods
+  STDMETHOD(DeleteBrowsingHistory)(DWORD flags);
+
+ protected:
+  // ChromeFrameDelegate overrides
+  virtual void OnAutomationServerReady();
+  virtual void OnAutomationServerLaunchFailed(
+      AutomationLaunchResult reason, const std::string& server_version);
+
+  virtual void GetProfilePath(const std::wstring& profile_name,
+                              FilePath* profile_path);
+
+ private:
+  unsigned long remove_mask_;
+  MessageLoopForUI loop_;
+};
+
+#endif  // CHROME_FRAME_DELETE_CHROME_HISTORY_H_