AAPT2: Better debugging output

Test: make aapt2_tests
Change-Id: I7778b773201381538dc1f2e376abee4eb33e44c0
diff --git a/tools/aapt2/process/SymbolTable.cpp b/tools/aapt2/process/SymbolTable.cpp
index 882a85b..2d517c7 100644
--- a/tools/aapt2/process/SymbolTable.cpp
+++ b/tools/aapt2/process/SymbolTable.cpp
@@ -289,7 +289,7 @@
   const android::ResTable& table = assets_.getResources(false);
 
   const std::u16string package16 = util::Utf8ToUtf16(name.package);
-  const std::u16string type16 = util::Utf8ToUtf16(ToString(name.type));
+  const std::u16string type16 = util::Utf8ToUtf16(to_string(name.type));
   const std::u16string entry16 = util::Utf8ToUtf16(name.entry);
 
   uint32_t type_spec_flags = 0;