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

src/interface.cc

Index: src/interface.cc
diff --git a/src/interface.cc b/src/interface.cc
index 1634a37113fca9c3266d9ca248354250725b1fb0..603dfe9b8639307e63cd21e4da94effba80fe2a7 100644
--- a/src/interface.cc
+++ b/src/interface.cc
@@ -35,8 +35,8 @@ namespace internal {
 static bool Match(void* key1, void* key2) {
   String* name1 = *static_cast<String**>(key1);
   String* name2 = *static_cast<String**>(key2);
-  ASSERT(name1->IsSymbol());
-  ASSERT(name2->IsSymbol());
+  ASSERT(name1->IsInternalizedString());
+  ASSERT(name2->IsInternalizedString());
   return name1 == name2;
 }