Make StringPiece to be std::string_view alias

Bug: 237583012
Test: build + boot + UTs

Change-Id: I849831f4466d3b9c7ec842b75256e7fcba77a0c0
diff --git a/tools/aapt2/text/Utf8Iterator.cpp b/tools/aapt2/text/Utf8Iterator.cpp
index 20b9073..0bd8a37 100644
--- a/tools/aapt2/text/Utf8Iterator.cpp
+++ b/tools/aapt2/text/Utf8Iterator.cpp
@@ -24,7 +24,7 @@
 namespace aapt {
 namespace text {
 
-Utf8Iterator::Utf8Iterator(const StringPiece& str)
+Utf8Iterator::Utf8Iterator(StringPiece str)
     : str_(str), current_pos_(0), next_pos_(0), current_codepoint_(0) {
   DoNext();
 }