net: don't crash when failing dynamic pins.

net/base/transport_security_state.cc

Index: net/base/transport_security_state.cc
diff --git a/net/base/transport_security_state.cc b/net/base/transport_security_state.cc
index 034182bd8c8f72f81ab7bbd52b24daf51e859905..46807ab55d9a0b32435e0f40b1d6dfeafcc5163a 100644
--- a/net/base/transport_security_state.cc
+++ b/net/base/transport_security_state.cc
@@ -685,6 +685,11 @@ void TransportSecurityState::ReportUMAOnPinFailure(const std::string& host) {
                            kNumPreloadedSNISTS);
   }
 
+  if (!entry) {
+    // We don't care to report pin failures for dynamic pins.
+    return;
+  }
+
   DCHECK(entry);
   DCHECK(entry->pins.required_hashes);
   DCHECK(entry->second_level_domain_name != DOMAIN_NOT_PINNED);