Component updater must fallback on using HTTP on Windows XPSP2 and below

base/win/win_util.h

Index: base/win/win_util.h
diff --git a/base/win/win_util.h b/base/win/win_util.h
index 573c4c72506cce4119801783121085e280b758a9..94395976aac91a2482a7d53fb5753a559ca6d899 100644
--- a/base/win/win_util.h
+++ b/base/win/win_util.h
@@ -134,6 +134,13 @@ BASE_EXPORT bool IsEnrolledToDomain();
 // 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();
+
 }  // namespace win
 }  // namespace base