Cleanup host getter (#28547)

* cleanup host getter

* remove test

src/core/lib/security/authorization/cel_authorization_engine.cc

@@ -103,7 +103,7 @@ std::unique_ptr<mock_cel::Activation> CelAuthorizationEngine::CreateActivation(
                                 mock_cel::CelValue::CreateStringView(url_path));
       }
     } else if (elem == kHost) {
-      absl::string_view host(args.GetHost());
+      absl::string_view host(args.GetAuthority());
       if (!host.empty()) {
         activation->InsertValue(kHost,
                                 mock_cel::CelValue::CreateStringView(host));

src/core/lib/security/authorization/evaluate_args.cc

@@ -90,16 +90,6 @@ absl::string_view EvaluateArgs::GetPath() const {
   return absl::string_view();
 }
 
-absl::string_view EvaluateArgs::GetHost() const {
-  absl::string_view host;
-  if (metadata_ != nullptr) {
-    if (auto* host_md = metadata_->get_pointer(HostMetadata())) {
-      host = host_md->as_string_view();
-    }
-  }
-  return host;
-}
-
 absl::string_view EvaluateArgs::GetAuthority() const {
   absl::string_view authority;
   if (metadata_ != nullptr) {

src/core/lib/security/authorization/evaluate_args.h

@@ -57,7 +57,6 @@ class EvaluateArgs {
       : metadata_(metadata), channel_args_(channel_args) {}
 
   absl::string_view GetPath() const;
-  absl::string_view GetHost() const;
   absl::string_view GetAuthority() const;
   absl::string_view GetMethod() const;
   // Returns metadata value(s) for the specified key.

test/core/security/evaluate_args_test.cc

@@ -34,7 +34,6 @@ TEST_F(EvaluateArgsTest, EmptyMetadata) {
   EvaluateArgs args = util_.MakeEvaluateArgs();
   EXPECT_EQ(args.GetPath(), nullptr);
   EXPECT_EQ(args.GetMethod(), nullptr);
-  EXPECT_EQ(args.GetHost(), nullptr);
   EXPECT_EQ(args.GetAuthority(), nullptr);
   EXPECT_EQ(args.GetHeaderValue("some_key", nullptr), absl::nullopt);
 }
@@ -45,12 +44,6 @@ TEST_F(EvaluateArgsTest, GetPathSuccess) {
   EXPECT_EQ(args.GetPath(), "/expected/path");
 }
 
-TEST_F(EvaluateArgsTest, GetHostSuccess) {
-  util_.AddPairToMetadata("host", "host123");
-  EvaluateArgs args = util_.MakeEvaluateArgs();
-  EXPECT_EQ(args.GetHost(), "host123");
-}
-
 TEST_F(EvaluateArgsTest, GetAuthoritySuccess) {
   util_.AddPairToMetadata(":authority", "test.google.com");
   EvaluateArgs args = util_.MakeEvaluateArgs();