Remove Windows XP SHA-256 and ECDSA logic.

components/component_updater/component_updater_url_constants.cc

Index: components/component_updater/component_updater_url_constants.cc
diff --git a/components/component_updater/component_updater_url_constants.cc b/components/component_updater/component_updater_url_constants.cc
index 7c78f64bd3bf29beef2f408ca95f528caba723ef..3cb8ef1e289295f5bac947373088f0184385f1e9 100644
--- a/components/component_updater/component_updater_url_constants.cc
+++ b/components/component_updater/component_updater_url_constants.cc
@@ -6,9 +6,6 @@
 
 namespace component_updater {
 
-// The alternative URL for the v3 protocol service endpoint.
-const char kUpdaterAltUrl[] = "http://clients2.google.com/service/update2";
-
 // The default URL for the v3 protocol service endpoint. In some cases, the
 // component updater is allowed to fall back to and alternate URL source, if
 // the request to the default URL source fails.