Revert 107528 - Collect some histograms about signed binary downloads.

chrome/browser/safe_browsing/signature_util.h

-// 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.
-//
-// Utility functions to check executable signatures for malicious binary
-// detection.  Each platform has its own implementation of this class.
-
-#ifndef CHROME_BROWSER_SAFE_BROWSING_SIGNATURE_UTIL_H_
-#define CHROME_BROWSER_SAFE_BROWSING_SIGNATURE_UTIL_H_
-#pragma once
-
-class FilePath;
-
-namespace safe_browsing {
-namespace signature_util {
-
-// Returns true if the given file path contains a signature.  No checks are
-// performed as to the validity of the signature.
-bool IsSigned(const FilePath& file_path);
-
-}  // namespace signature_util
-}  // namespace safe_browsing
-
-#endif  // CHROME_BROWSER_SAFE_BROWSING_SIGNATURE_UTIL_H_