Replace deprecated base::NonThreadSafe in extensions in favor of SequenceChecker.

extensions/browser/quota_service.cc

Index: extensions/browser/quota_service.cc
diff --git a/extensions/browser/quota_service.cc b/extensions/browser/quota_service.cc
index 99967d775a20914fc29d46754ffbcb663b21753b..d17ff2df5adbf22fc9b3299625f1db72d5d42314 100644
--- a/extensions/browser/quota_service.cc
+++ b/extensions/browser/quota_service.cc
@@ -33,7 +33,7 @@ QuotaService::QuotaService() {
 }
 
 QuotaService::~QuotaService() {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   purge_timer_.Stop();
   Purge();
 }
@@ -42,7 +42,7 @@ std::string QuotaService::Assess(const std::string& extension_id,
                                  ExtensionFunction* function,
                                  const base::ListValue* args,
                                  const base::TimeTicks& event_time) {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 
   if (function->ShouldSkipQuotaLimiting())
     return std::string();
@@ -86,7 +86,7 @@ QuotaService::ScopedDisablePurgeForTesting::~ScopedDisablePurgeForTesting() {
 }
 
 void QuotaService::Purge() {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   for (auto it = function_heuristics_.begin(); it != function_heuristics_.end();
        function_heuristics_.erase(it++)) {
     it->second.clear();