Remove Windows XP SHA-256 and ECDSA logic.

base/win/win_util.h

 // Copyright (c) 2012 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.
 
 // =============================================================================
 // PLEASE READ
 //
 // In general, you should not be adding stuff to this file.
 //
 // - If your thing is only used in one place, just put it in a reasonable
@@ skipping 141 matching lines @@
 // above. Returns true on success.
 BASE_EXPORT bool DismissVirtualKeyboard();
 
 // Returns true if the machine is enrolled to a domain.
 BASE_EXPORT bool IsEnrolledToDomain();
 
 // Used by tests to mock any wanted state. Call with |state| set to true to
 // simulate being in a domain and false otherwise.
 BASE_EXPORT void SetDomainStateForTesting(bool state);
 
-// Returns true if the current operating system has support for SHA-256
-// certificates. As its name indicates, this function provides a best-effort
-// answer, which is solely based on comparing version numbers. The function
-// may be re-implemented in the future to return a reliable value, based on
-// run-time detection of this capability.
-BASE_EXPORT bool MaybeHasSHA256Support();
-
 // Returns true if the current process can make USER32 or GDI32 calls such as
 // CreateWindow and CreateDC. Windows 8 and above allow the kernel component
 // of these calls to be disabled which can cause undefined behaviour such as
 // crashes. This function can be used to guard areas of code using these calls
 // and provide a fallback path if necessary.
 BASE_EXPORT bool IsUser32AndGdi32Available();
 
 }  // namespace win
 }  // namespace base
 
 #endif  // BASE_WIN_WIN_UTIL_H_