base: Change DCHECK_IS_ON to a macro DCHECK_IS_ON().

cc/resources/prioritized_resource_manager.cc

Index: cc/resources/prioritized_resource_manager.cc
diff --git a/cc/resources/prioritized_resource_manager.cc b/cc/resources/prioritized_resource_manager.cc
index 657c14f4ddffb9bae1faeb94cb0942cc65941f16..459844684912d0afb417667a83fb5d8cf4591c92 100644
--- a/cc/resources/prioritized_resource_manager.cc
+++ b/cc/resources/prioritized_resource_manager.cc
@@ -481,7 +481,7 @@ void PrioritizedResourceManager::EvictFirstBackingResource(
 }
 
 void PrioritizedResourceManager::AssertInvariants() {
-#if DCHECK_IS_ON
+#if DCHECK_IS_ON()
   DCHECK(proxy_->IsImplThread() && proxy_->IsMainThreadBlocked());
 
   // If we hit any of these asserts, there is a bug in this class. To see
@@ -540,7 +540,7 @@ void PrioritizedResourceManager::AssertInvariants() {
       DCHECK(backing->CanBeRecycledIfNotInExternalUse());
     previous_backing = backing;
   }
-#endif  // DCHECK_IS_ON
+#endif  // DCHECK_IS_ON()
 }
 
 const Proxy* PrioritizedResourceManager::ProxyForDebug() const {