Perform TODO(gc) cleanup for TODO-lockdown.

src/store-buffer.h

Index: src/store-buffer.h
diff --git a/src/store-buffer.h b/src/store-buffer.h
index c354d360a9055276d2be939b93c385022ae0c42f..61b97d9e64f4a006146affdb5ca1db28bc9c299f 100644
--- a/src/store-buffer.h
+++ b/src/store-buffer.h
@@ -89,8 +89,9 @@ class StoreBuffer {
   static const int kHashMapLength = 1 << kHashMapLengthLog2;
 
   void Compact();
-  static void GCPrologue(GCType type, GCCallbackFlags flags);
-  static void GCEpilogue(GCType type, GCCallbackFlags flags);
+
+  void GCPrologue();
+  void GCEpilogue();
 
   Object*** Limit() { return reinterpret_cast<Object***>(old_limit_); }
   Object*** Start() { return reinterpret_cast<Object***>(old_start_); }