Remove Windows XP SHA-256 and ECDSA logic.

components/component_updater/configurator_impl.cc

Index: components/component_updater/configurator_impl.cc
diff --git a/components/component_updater/configurator_impl.cc b/components/component_updater/configurator_impl.cc
index 407da85963535e8b92165663e5404ab45f0d8f5c..be529131ffff6fafe6f3df98341c7652d07bae7f 100644
--- a/components/component_updater/configurator_impl.cc
+++ b/components/component_updater/configurator_impl.cc
@@ -59,19 +59,6 @@ bool HasSwitchValue(const std::vector<std::string>& vec, const char* test) {
   return (std::find(vec.begin(), vec.end(), test) != vec.end());
 }
 
-// Returns true if falling back on an alternate, unsafe, service URL is
-// allowed. In the fallback case, the security of the component update relies
-// only on the integrity of the CRX payloads, which is self-validating.
-// This is allowed only for some of the pre-Windows Vista versions not including
-// Windows XP SP3. As a side note, pings could be sent to the alternate URL too.
-bool CanUseAltUrlSource() {
-#if defined(OS_WIN)
-  return !base::win::MaybeHasSHA256Support();
-#else
-  return false;
-#endif  // OS_WIN
-}
-
 // If there is an element of |vec| of the form |test|=.*, returns the right-
 // hand side of that assignment. Otherwise, returns an empty string.
 // The right-hand side may contain additional '=' characters, allowing for
@@ -101,8 +88,7 @@ ConfiguratorImpl::ConfiguratorImpl(
       fast_update_(false),
       pings_enabled_(false),
       deltas_enabled_(false),
-      background_downloads_enabled_(false),
-      fallback_to_alt_source_url_enabled_(false) {
+      background_downloads_enabled_(false) {
   // Parse comma-delimited debug flags.
   std::vector<std::string> switch_values = base::SplitString(
       cmdline->GetSwitchValueASCII(switches::kComponentUpdater), ",",
@@ -127,8 +113,6 @@ ConfiguratorImpl::ConfiguratorImpl(
 
   if (HasSwitchValue(switch_values, kSwitchRequestParam))
     extra_info_ += "testrequest=\"1\"";
-
-  fallback_to_alt_source_url_enabled_ = CanUseAltUrlSource();
 }
 
 ConfiguratorImpl::~ConfiguratorImpl() {}
@@ -159,9 +143,6 @@ std::vector<GURL> ConfiguratorImpl::UpdateUrl() const {
     urls.push_back(GURL(url_source_override_));
   } else {
     urls.push_back(GURL(kUpdaterDefaultUrl));
-    if (fallback_to_alt_source_url_enabled_) {
-      urls.push_back(GURL(kUpdaterAltUrl));
-    }
   }
   return urls;
 }
@@ -194,8 +175,4 @@ bool ConfiguratorImpl::UseBackgroundDownloader() const {
   return background_downloads_enabled_;
 }
 
-void ConfiguratorImpl::set_enable_alt_source_url(bool enable_alt_source_url) {
-  fallback_to_alt_source_url_enabled_ = enable_alt_source_url;
-}
-
 }  // namespace component_updater