Renamed "symbols" to "internalized strings" throughout the code base,

src/mark-compact.h

Index: src/mark-compact.h
diff --git a/src/mark-compact.h b/src/mark-compact.h
index 2613a3e13516ec726a207280b3970fd0b5f1d9fb..a8c4e30fda2b4fd6a759098313917235a987e1ab 100644
--- a/src/mark-compact.h
+++ b/src/mark-compact.h
@@ -788,9 +788,9 @@ class MarkCompactCollector {
   // Mark the heap roots and all objects reachable from them.
   void MarkRoots(RootMarkingVisitor* visitor);
 
-  // Mark the symbol table specially.  References to symbols from the
-  // symbol table are weak.
-  void MarkSymbolTable();
+  // Mark the string table specially.  References to internalized strings from
+  // the string table are weak.
+  void MarkStringTable();
 
   // Mark objects in implicit references groups if their parent object
   // is marked.