Add a new QUIC platform API for text utilities.

net/quic/core/crypto/crypto_handshake_message.cc

Index: net/quic/core/crypto/crypto_handshake_message.cc
diff --git a/net/quic/core/crypto/crypto_handshake_message.cc b/net/quic/core/crypto/crypto_handshake_message.cc
index 74c978f8ca4051813581fc7f465f666ca16ddab1..fcaf59b5f6ff7d241e59e13946f78694d26bdb36 100644
--- a/net/quic/core/crypto/crypto_handshake_message.cc
+++ b/net/quic/core/crypto/crypto_handshake_message.cc
@@ -7,13 +7,13 @@
 #include <memory>
 
 #include "base/stl_util.h"
-#include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "net/quic/core/crypto/crypto_framer.h"
 #include "net/quic/core/crypto/crypto_protocol.h"
 #include "net/quic/core/crypto/crypto_utils.h"
 #include "net/quic/core/quic_socket_address_coder.h"
 #include "net/quic/core/quic_utils.h"
+#include "net/quic/platform/api/quic_text_utils.h"
 
 using base::ContainsKey;
 using base::StringPiece;
@@ -234,7 +234,7 @@ string CryptoHandshakeMessage::DebugStringInternal(size_t indent) const {
         if (it->second.size() == 4) {
           uint32_t value;
           memcpy(&value, it->second.data(), sizeof(value));
-          ret += base::UintToString(value);
+          ret += QuicTextUtils::Uint64ToString(value);
           done = true;
         }
         break;
@@ -243,7 +243,7 @@ string CryptoHandshakeMessage::DebugStringInternal(size_t indent) const {
         if (it->second.size() == 8) {
           uint64_t value;
           memcpy(&value, it->second.data(), sizeof(value));
-          ret += base::Uint64ToString(value);
+          ret += QuicTextUtils::Uint64ToString(value);
           done = true;
         }
         break;
@@ -319,7 +319,7 @@ string CryptoHandshakeMessage::DebugStringInternal(size_t indent) const {
     if (!done) {
       // If there's no specific format for this tag, or the value is invalid,
       // then just use hex.
-      ret += "0x" + QuicUtils::HexEncode(it->second);
+      ret += "0x" + QuicTextUtils::HexEncode(it->second);
     }
     ret += "\n";
   }