Make StringPiece to be std::string_view alias

Bug: 237583012
Test: build + boot + UTs

Change-Id: I849831f4466d3b9c7ec842b75256e7fcba77a0c0
diff --git a/tools/aapt2/xml/XmlActionExecutor.cpp b/tools/aapt2/xml/XmlActionExecutor.cpp
index 9bdbd22..3ccbaa2 100644
--- a/tools/aapt2/xml/XmlActionExecutor.cpp
+++ b/tools/aapt2/xml/XmlActionExecutor.cpp
@@ -84,7 +84,7 @@
         error_msg << "unexpected element ";
         PrintElementToDiagMessage(child_el, &error_msg);
         error_msg << " found in ";
-        for (const StringPiece& element : *bread_crumb) {
+        for (StringPiece element : *bread_crumb) {
           error_msg << "<" << element << ">";
         }
         if (policy == XmlActionExecutorPolicy::kAllowListWarning) {