Deprecate NonThreadSafe in net/ in favor of SequenceChecker/ThreadChecker.

net/http/transport_security_state.h

Index: net/http/transport_security_state.h
diff --git a/net/http/transport_security_state.h b/net/http/transport_security_state.h
index 7ce883a952a271cae547bd97544ebc13c142b487..0f53dd26e61448b9b4e1e8b4c0f8fcf86238f88e 100644
--- a/net/http/transport_security_state.h
+++ b/net/http/transport_security_state.h
@@ -14,8 +14,8 @@
 #include "base/feature_list.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
+#include "base/sequence_checker.h"
 #include "base/strings/string_piece.h"
-#include "base/threading/non_thread_safe.h"
 #include "base/time/time.h"
 #include "net/base/expiring_cache.h"
 #include "net/base/hash_value.h"
@@ -47,8 +47,7 @@ void NET_EXPORT_PRIVATE SetTransportSecurityStateSourceForTesting(
 // http://tools.ietf.org/html/ietf-websec-strict-transport-sec, and
 // HTTP-based dynamic public key pinning (HPKP) is defined in
 // http://tools.ietf.org/html/ietf-websec-key-pinning.
-class NET_EXPORT TransportSecurityState
-    : NON_EXPORTED_BASE(public base::NonThreadSafe) {
+class NET_EXPORT TransportSecurityState {
  public:
   class NET_EXPORT Delegate {
    public:
@@ -566,6 +565,10 @@ class NET_EXPORT TransportSecurityState
                              const HostPortPair& host_port_pair,
                              const SSLInfo& ssl_info);
 
+  void AssertCalledOnValidSequence() const {
+    DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
+  }
+
   // For unit tests only. Causes CheckCTRequirements() to return
   // CT_REQUIREMENTS_NOT_MET (if |*required| is true) or CT_REQUIREMENTS_MET (if
   // |*required| is false) for non-compliant connections by default (that is,
@@ -696,6 +699,8 @@ class NET_EXPORT TransportSecurityState
   ExpiringCache<std::string, bool, base::TimeTicks, std::less<base::TimeTicks>>
       sent_reports_cache_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(TransportSecurityState);
 };