Replace quiche::QuicheStringPiece with absl::string_view.

PiperOrigin-RevId: 336792322
Change-Id: I930e033b8097de7504a93b906618e69fc65be435
diff --git a/http2/tools/random_util.cc b/http2/tools/random_util.cc
index a0af07a..01571ed 100644
--- a/http2/tools/random_util.cc
+++ b/http2/tools/random_util.cc
@@ -12,7 +12,7 @@
 // Here "word" means something that starts with a lower-case letter, and has
 // zero or more additional characters that are numbers or lower-case letters.
 std::string GenerateHttp2HeaderName(size_t len, Http2Random* rng) {
-  quiche::QuicheStringPiece alpha_lc = "abcdefghijklmnopqrstuvwxyz";
+  absl::string_view alpha_lc = "abcdefghijklmnopqrstuvwxyz";
   // If the name is short, just make it one word.
   if (len < 8) {
     return rng->RandStringWithAlphabet(len, alpha_lc);
@@ -20,8 +20,7 @@
   // If the name is longer, ensure it starts with a word, and after that may
   // have any character in alphanumdash_lc. 4 is arbitrary, could be as low
   // as 1.
-  quiche::QuicheStringPiece alphanumdash_lc =
-      "abcdefghijklmnopqrstuvwxyz0123456789-";
+  absl::string_view alphanumdash_lc = "abcdefghijklmnopqrstuvwxyz0123456789-";
   return rng->RandStringWithAlphabet(4, alpha_lc) +
          rng->RandStringWithAlphabet(len - 4, alphanumdash_lc);
 }