Nits follow-up to TaskToken CL

base/sequence_token.cc

Index: base/sequence_token.cc
diff --git a/base/sequence_token.cc b/base/sequence_token.cc
index 95eafb7562a474e34aec398d4f0d213eda34842f..1178181ddcafbad2583d9acb7c43a48990025a53 100644
--- a/base/sequence_token.cc
+++ b/base/sequence_token.cc
@@ -26,7 +26,7 @@ LazyInstance<ThreadLocalPointer<const TaskToken>>::Leaky
 }  // namespace
 
 bool SequenceToken::operator==(const SequenceToken& other) const {
-  return token_ == other.token_ && token_ != kInvalidSequenceToken;
+  return token_ == other.token_ && IsValid();
 }
 
 bool SequenceToken::operator!=(const SequenceToken& other) const {
@@ -48,7 +48,7 @@ SequenceToken SequenceToken::GetForCurrentThread() {
 }
 
 bool TaskToken::operator==(const TaskToken& other) const {
-  return token_ == other.token_ && token_ != kInvalidTaskToken;
+  return token_ == other.token_ && IsValid();
 }
 
 bool TaskToken::operator!=(const TaskToken& other) const {