Replace deprecated base::NonThreadSafe in content/browser/memory in favor of SequenceChecker.

content/browser/memory/memory_coordinator_impl.cc

Index: content/browser/memory/memory_coordinator_impl.cc
diff --git a/content/browser/memory/memory_coordinator_impl.cc b/content/browser/memory/memory_coordinator_impl.cc
index d0b138dfc034f90473521d82e797296b30631169..1f59ea6761bbc23c4f80536aebcd6127d715c8cb 100644
--- a/content/browser/memory/memory_coordinator_impl.cc
+++ b/content/browser/memory/memory_coordinator_impl.cc
@@ -147,11 +147,12 @@ MemoryCoordinatorImpl::MemoryCoordinatorImpl(
 }
 
 MemoryCoordinatorImpl::~MemoryCoordinatorImpl() {
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   base::MemoryCoordinatorProxy::SetMemoryCoordinator(nullptr);
 }
 
 void MemoryCoordinatorImpl::Start() {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   DCHECK(last_state_change_.is_null());
 
   notification_registrar_.Add(
@@ -304,7 +305,7 @@ void MemoryCoordinatorImpl::Observe(int type,
 
 MemoryState MemoryCoordinatorImpl::GetStateForProcess(
     base::ProcessHandle handle) {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   if (handle == base::kNullProcessHandle)
     return MemoryState::UNKNOWN;
   if (handle == base::GetCurrentProcessHandle())
@@ -320,7 +321,7 @@ MemoryState MemoryCoordinatorImpl::GetStateForProcess(
 
 void MemoryCoordinatorImpl::UpdateConditionIfNeeded(
     MemoryCondition next_condition) {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 
   if (next_condition == MemoryCondition::WARNING)
     policy_->OnWarningCondition();