Remove multi-install from install_static.

chrome/install_static/product_install_details.h

 // Copyright 2016 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.
 
 // Contains functions for determining the product's InstallDetails at runtime.
 
 #ifndef CHROME_INSTALL_STATIC_PRODUCT_INSTALL_DETAILS_H_
 #define CHROME_INSTALL_STATIC_PRODUCT_INSTALL_DETAILS_H_
 
 #include <memory>
 #include <string>
 
 namespace install_static {
 
-struct InstallConstants;
 class PrimaryInstallDetails;
 
 // Creates product details for the current process and sets them as the global
 // InstallDetails for the process. This is intended to be called early in
 // process startup. A process's "primary" module may be the executable itself or
 // may be another DLL that is loaded and initialized prior to executing the
 // executable's entrypoint (i.e., chrome_elf.dll).
 void InitializeProductDetailsForPrimaryModule();
 
 // Returns true if |parent| is a parent of |path|. Path separators at the end of
 // |parent| are ignored. Returns false if |parent| is empty.
 bool IsPathParentOf(const wchar_t* parent,
                     size_t parent_len,
                     const std::wstring& path);
 
 // Returns true if |path| is within C:\Program Files{, (x86)}.
 bool PathIsInProgramFiles(const std::wstring& path);
 
 // Returns the install suffix embedded in |exe_path| or an empty string if none
 // is found. |exe_path| is expected be something similar to
 // "...\[kProductName][suffix]\Application".
 std::wstring GetInstallSuffix(const std::wstring& exe_path);
 
-// Returns true if the browser of |mode| at |system_level| is registered as
-// being multi-install.
-bool IsMultiInstall(const InstallConstants& mode, bool system_level);
-
 // Creates product details for the process at |exe_path|.
 std::unique_ptr<PrimaryInstallDetails> MakeProductDetails(
     const std::wstring& exe_path);
 
 }  // namespace install_static
 
 #endif  // CHROME_INSTALL_STATIC_PRODUCT_INSTALL_DETAILS_H_