net: remove TLS fallback for Google properties.

net/http/http_network_transaction.cc

Index: net/http/http_network_transaction.cc
diff --git a/net/http/http_network_transaction.cc b/net/http/http_network_transaction.cc
index 9e24da8863e1c35eb6c5fa25effdf1ded10274b9..707751a79c3338a43b6e38dfc7c36fa08a8dcacf 100644
--- a/net/http/http_network_transaction.cc
+++ b/net/http/http_network_transaction.cc
@@ -1243,21 +1243,7 @@ int HttpNetworkTransaction::HandleSSLHandshakeError(int error) {
         // version_max should match the maximum protocol version supported
         // by the SSLClientSocket class.
         version_max--;
-
-        // Fallback to the lower SSL version.
-        // While SSL 3.0 fallback should be eliminated because of security
-        // reasons, there is a high risk of breaking the servers if this is
-        // done in general.
-        // For now SSL 3.0 fallback is disabled for Google servers first,
-        // and will be expanded to other servers after enough experiences
-        // have been gained showing that this experiment works well with
-        // today's Internet.
-        if (version_max > SSL_PROTOCOL_VERSION_SSL3 ||
-            (server_ssl_config_.unrestricted_ssl3_fallback_enabled ||
-             !TransportSecurityState::IsGooglePinnedProperty(
-                 request_->url.host(), true /* include SNI */))) {
-          should_fallback = true;
-        }
+        should_fallback = true;
       }
       break;
     case ERR_SSL_BAD_RECORD_MAC_ALERT:
@@ -1273,6 +1259,22 @@ int HttpNetworkTransaction::HandleSSLHandshakeError(int error) {
       break;
   }
 
+  // While fallback should be eliminated because of security reasons,
+  // there is a high risk of breaking the servers if this is done in
+  // general.
+  //
+  // For now fallback is disabled for Google servers first, and will be
+  // expanded to other servers after enough experiences have been gained
+  // showing that this experiment works well with today's Internet.
+  //
+  // The --enable-unrestricted-ssl3-fallback command-line flag exists to allow
+  // fallback to any version, all the way down to SSLv3.
+  if (!server_ssl_config_.unrestricted_ssl3_fallback_enabled &&
+      TransportSecurityState::IsGooglePinnedProperty(request_->url.host(),
+                                                     true /* include SNI */)) {
+    should_fallback = false;
+  }
+
   if (should_fallback) {
     net_log_.AddEvent(
         NetLog::TYPE_SSL_VERSION_FALLBACK,