Replace deprecated base::NonThreadSafe in chrome/browser/ssl in favor of SequenceChecker.

chrome/browser/ssl/common_name_mismatch_handler.h

Index: chrome/browser/ssl/common_name_mismatch_handler.h
diff --git a/chrome/browser/ssl/common_name_mismatch_handler.h b/chrome/browser/ssl/common_name_mismatch_handler.h
index 5d362266c9d224a2e765605d586cdbe0059341d1..d79f57ee1c6ea3a1472e8ac4066dc02d051b34a0 100644
--- a/chrome/browser/ssl/common_name_mismatch_handler.h
+++ b/chrome/browser/ssl/common_name_mismatch_handler.h
@@ -10,7 +10,7 @@
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "base/time/time.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
@@ -24,8 +24,7 @@ class URLFetcher;
 // This class handles errors due to common name mismatches
 // (|ERR_CERT_COMMON_NAME_INVALID|) and helps remediate them by suggesting
 // alternative URLs that may be what the user intended to load.
-class CommonNameMismatchHandler : public net::URLFetcherDelegate,
-                                  public base::NonThreadSafe {
+class CommonNameMismatchHandler : public net::URLFetcherDelegate {
  public:
   enum SuggestedUrlCheckResult {
     // The request succeeds with good response code i.e. URL exists and its
@@ -86,6 +85,8 @@ class CommonNameMismatchHandler : public net::URLFetcherDelegate,
   CheckUrlCallback check_url_callback_;
   std::unique_ptr<net::URLFetcher> url_fetcher_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(CommonNameMismatchHandler);
 };