Remove ClonedInstallDetector/MachineIdProvider //content dependencies

chrome/browser/metrics/machine_id_provider_win.cc

 // Copyright 2014 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/metrics/machine_id_provider.h"
 
 #include <windows.h>
 #include <winioctl.h>
 
 #include "base/base_paths.h"
 #include "base/files/file_path.h"
 #include "base/path_service.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/win/scoped_handle.h"
-#include "content/public/browser/browser_thread.h"
 
 namespace metrics {
 
 MachineIdProvider::MachineIdProvider() {}
 MachineIdProvider::~MachineIdProvider() {}
 
 // On windows, the machine id is based on the serial number of the drive Chrome
 // is running from.
 std::string MachineIdProvider::GetMachineId() {
-  DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::FILE));
+  base::ThreadRestrictions::AssertIOAllowed();
 
   // Use the program's path to get the drive used for the machine id. This means
   // that whenever the underlying drive changes, it's considered a new machine.
   // This is fine as we do not support migrating Chrome installs to new drives.
   base::FilePath executable_path;
 
   if (!PathService::Get(base::FILE_EXE, &executable_path)) {
     NOTREACHED();
     return std::string();
   }
@@ skipping 62 matching lines @@
 
   return std::string(serial_number);
 }
 
 // static
 MachineIdProvider* MachineIdProvider::CreateInstance() {
   return new MachineIdProvider();
 }
 
 } //  namespace metrics