Properly mangle file names

Change-Id: I49c0f82e8c06f056198eb64b8369d83403b74321
diff --git a/tools/aapt2/TableFlattener.h b/tools/aapt2/TableFlattener.h
index 0ae798c..ccbb737 100644
--- a/tools/aapt2/TableFlattener.h
+++ b/tools/aapt2/TableFlattener.h
@@ -22,6 +22,8 @@
 
 namespace aapt {
 
+using SymbolEntryVector = std::vector<std::pair<ResourceNameRef, uint32_t>>;
+
 struct FlatEntry;
 
 /**
@@ -49,8 +51,7 @@
     bool flatten(BigBuffer* out, const ResourceTable& table);
 
 private:
-    bool flattenValue(BigBuffer* out, const FlatEntry& flatEntry,
-                      std::vector<std::pair<ResourceNameRef, uint32_t>>& symbolEntries);
+    bool flattenValue(BigBuffer* out, const FlatEntry& flatEntry, SymbolEntryVector* symbols);
 
     Options mOptions;
 };