Change dont_embed_build_metadata default to 1 except for Official build and fix some unittests.

net/http/transport_security_state.cc

Index: net/http/transport_security_state.cc
diff --git a/net/http/transport_security_state.cc b/net/http/transport_security_state.cc
index d0c0b33a896588bc86e6e1c1414f9d3532f60284..907e6d88a089471e969b2af3becfa528237a9e76 100644
--- a/net/http/transport_security_state.cc
+++ b/net/http/transport_security_state.cc
@@ -721,9 +721,18 @@ void TransportSecurityState::ReportUMAOnPinFailure(const std::string& host) {
 
 // static
 bool TransportSecurityState::IsBuildTimely() {
+  // If the build metadata aren't embedded in the binary then we can't use the
+  // build time to determine if the build is timely, return true by default. If
+  // we're building an official build then keep using the build time, even if
+  // it's invalid it'd be a date in the past and this function will return
+  // false.
+#if defined(DONT_EMBED_BUILD_METADATA) && !defined(OFFICIAL_BUILD)
+  return true;
+#else
   const base::Time build_time = base::GetBuildTime();
   // We consider built-in information to be timely for 10 weeks.
   return (base::Time::Now() - build_time).InDays() < 70 /* 10 weeks */;
+#endif
 }
 
 bool TransportSecurityState::CheckPublicKeyPinsImpl(