Move profiler callback interfaces from v8.h to v8-profiler.h

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index fe43c4d6269a66fbb0db610072edb2ccdc800710..2bc53f63dec7115739dac92b5e64228cdadf425d 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -7133,9 +7133,6 @@ void HeapSnapshot::Serialize(OutputStream* stream,
   Utils::ApiCheck(format == kJSON,
                   "v8::HeapSnapshot::Serialize",
                   "Unknown serialization format");
-  Utils::ApiCheck(stream->GetOutputEncoding() == OutputStream::kAscii,
-                  "v8::HeapSnapshot::Serialize",
-                  "Unsupported output encoding");
   Utils::ApiCheck(stream->GetChunkSize() > 0,
                   "v8::HeapSnapshot::Serialize",
                   "Invalid stream chunk size");