memory-infra: Move dump level check to observer and rename session state

base/trace_event/memory_dump_session_state.cc

Index: base/trace_event/memory_dump_session_state.cc
diff --git a/base/trace_event/memory_dump_session_state.cc b/base/trace_event/memory_dump_session_state.cc
index d26b82a5b74c65f774403eb7fae1cc88ba556f7f..219945f298aaeac557fc228762f7660140f77a16 100644
--- a/base/trace_event/memory_dump_session_state.cc
+++ b/base/trace_event/memory_dump_session_state.cc
@@ -23,15 +23,5 @@ void MemoryDumpSessionState::SetTypeNameDeduplicator(
   type_name_deduplicator_ = std::move(type_name_deduplicator);
 }
 
-void MemoryDumpSessionState::SetAllowedDumpModes(
-    std::set<MemoryDumpLevelOfDetail> allowed_dump_modes) {
-  allowed_dump_modes_ = allowed_dump_modes;
-}
-
-bool MemoryDumpSessionState::IsDumpModeAllowed(
-    MemoryDumpLevelOfDetail dump_mode) const {
-  return allowed_dump_modes_.count(dump_mode) != 0;
-}
-
 }  // namespace trace_event
 }  // namespace base