Remove dead SharedFunctionInfo::TrimOptimizedCodeMap.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index c802e91626d24d0dd5d705ee5f4d7379b8fb3723..66a53db37012a62dbf293f631bf1ba7980cdab13 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -7463,9 +7463,6 @@ class SharedFunctionInfo: public HeapObject {
   // the entry itself is left in the map in order to proceed sharing literals.
   void EvictFromOptimizedCodeMap(Code* optimized_code, const char* reason);
 
-  // Trims the optimized code map after entries have been removed.
-  void TrimOptimizedCodeMap(int shrink_by);
-
   static Handle<LiteralsArray> FindOrCreateLiterals(
       Handle<SharedFunctionInfo> shared, Handle<Context> native_context);