vulkan: fix release build

gpu/vulkan/vulkan_implementation.cc

Index: gpu/vulkan/vulkan_implementation.cc
diff --git a/gpu/vulkan/vulkan_implementation.cc b/gpu/vulkan/vulkan_implementation.cc
index db6a3d52de815d9a5240c4dcc2e80c5f069f45c4..9a7159409258186a5ccbedd8bc1502c0bf256f39 100644
--- a/gpu/vulkan/vulkan_implementation.cc
+++ b/gpu/vulkan/vulkan_implementation.cc
@@ -131,6 +131,7 @@ struct VulkanInstance {
       return false;
     }
 
+#if DCHECK_IS_ON()
     // Register our error logging function.
     if (debug_report_enabled) {
       PFN_vkCreateDebugReportCallbackEXT vkCreateDebugReportCallbackEXT =
@@ -163,6 +164,7 @@ struct VulkanInstance {
         return false;
       }
     }
+#endif
 
     return true;
   }