first-run: Pull IsBrowserAlreadyRunning() out of upgrade_util_win.h.

chrome/browser/browser_util_win.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 "chrome/browser/browser_util_win.h"
+
+#include <windows.h>
+
+#include <algorithm>
+#include <string>
+
+#include "base/base_paths.h"
+#include "base/file_path.h"
+#include "base/path_service.h"
+
+namespace browser_util {
+
+bool IsBrowserAlreadyRunning() {
+  static HANDLE handle = NULL;
+  FilePath exe_path;
+  PathService::Get(base::FILE_EXE, &exe_path);
+  std::wstring exe = exe_path.value();
+  std::replace(exe.begin(), exe.end(), '\\', '!');
+  std::transform(exe.begin(), exe.end(), exe.begin(), tolower);
+  exe = L"Global\\" + exe;
+  if (handle != NULL)
+    CloseHandle(handle);
+  handle = CreateEvent(NULL, TRUE, TRUE, exe.c_str());
+  int error = GetLastError();
+  return (error == ERROR_ALREADY_EXISTS || error == ERROR_ACCESS_DENIED);
+}
+
+}  // namespace browser_util