Rename ContextCloseCode::NO_ERROR to ContextCloseCode::CLOSE_NO_ERROR

This unblocks Chrome merge because NO_ERROR is already defined in winerror.h so this enum doesn't compile on Windows.

PiperOrigin-RevId: 399992063

quic/core/http/capsule.cc

diff --git a/quic/core/http/capsule.cc b/quic/core/http/capsule.cc
index 8f72955..89c9105 100644
--- a/quic/core/http/capsule.cc
+++ b/quic/core/http/capsule.cc
@@ -55,7 +55,7 @@
 
 std::string ContextCloseCodeToString(ContextCloseCode context_close_code) {
   switch (context_close_code) {
-    case ContextCloseCode::NO_ERROR:
+    case ContextCloseCode::CLOSE_NO_ERROR:
       return "NO_ERROR";
     case ContextCloseCode::UNKNOWN_FORMAT:
       return "UNKNOWN_FORMAT";

quic/core/http/capsule.h

diff --git a/quic/core/http/capsule.h b/quic/core/http/capsule.h
index 664633a..4117719 100644
--- a/quic/core/http/capsule.h
+++ b/quic/core/http/capsule.h
@@ -43,7 +43,7 @@
 
 enum class ContextCloseCode : uint64_t {
   // Casing in this enum matches the IETF specification.
-  NO_ERROR = 0xff78a0,
+  CLOSE_NO_ERROR = 0xff78a0,  // NO_ERROR already exists in winerror.h.
   UNKNOWN_FORMAT = 0xff78a1,
   DENIED = 0xff78a2,
   RESOURCE_LIMIT = 0xff78a3,
@@ -91,7 +91,7 @@
       absl::string_view format_additional_data = absl::string_view());
   static Capsule CloseDatagramContext(
       QuicDatagramContextId context_id,
-      ContextCloseCode close_code = ContextCloseCode::NO_ERROR,
+      ContextCloseCode close_code = ContextCloseCode::CLOSE_NO_ERROR,
       absl::string_view close_details = absl::string_view());
   static Capsule Unknown(
       uint64_t capsule_type,