Now we have many code to load snapshot files;

#ifdef V8_USE_EXTERNAL_STARTUP
LoadV8Snapshot();
#ifdef USE_V8_CONTEXT_SNAPSHOT
LoadV8ContextSnapshot();
#endif
#endif

but now we know that it possible substitute v8_context_snapshot.bin for snapshot_blob.bin. So the above code can be simply

#ifdef V8_USE_EXTERNAL_STARTUP
LoadV8Snapshot();
#endif

and which file to load should be detected in the function LoadV8Snapshot(),
depending on USE_V8_CONTEXT_SNAPSHOT.