[iwyu] Fix sanity on master (#30366)

src/core/ext/filters/client_channel/lb_policy/xds/cds.cc

@@ -21,7 +21,6 @@
 #include <memory>
 #include <set>
 #include <string>
-#include <type_traits>
 #include <utility>
 #include <vector>
 

test/core/end2end/tests/retry_lb_drop.cc

@@ -24,8 +24,6 @@
 
 #include "absl/memory/memory.h"
 #include "absl/status/status.h"
-#include "absl/status/statusor.h"
-#include "absl/strings/string_view.h"
 
 #include <grpc/byte_buffer.h>
 #include <grpc/grpc.h>
@@ -41,6 +39,7 @@
 #include "src/core/lib/gpr/useful.h"
 #include "src/core/lib/gprpp/orphanable.h"
 #include "src/core/lib/gprpp/ref_counted_ptr.h"
+#include "src/core/lib/iomgr/error.h"
 #include "src/core/lib/json/json.h"
 #include "test/core/end2end/cq_verifier.h"
 #include "test/core/end2end/end2end_tests.h"

test/core/end2end/tests/retry_lb_fail.cc

@@ -23,8 +23,6 @@
 
 #include "absl/memory/memory.h"
 #include "absl/status/status.h"
-#include "absl/status/statusor.h"
-#include "absl/strings/string_view.h"
 
 #include <grpc/byte_buffer.h>
 #include <grpc/grpc.h>
@@ -40,6 +38,7 @@
 #include "src/core/lib/gpr/useful.h"
 #include "src/core/lib/gprpp/orphanable.h"
 #include "src/core/lib/gprpp/ref_counted_ptr.h"
+#include "src/core/lib/iomgr/error.h"
 #include "src/core/lib/json/json.h"
 #include "test/core/end2end/cq_verifier.h"
 #include "test/core/end2end/end2end_tests.h"

test/core/util/test_lb_policies.h

@@ -23,7 +23,6 @@
 #include <vector>
 
 #include "absl/status/status.h"
-#include "absl/strings/string_view.h"
 
 #include "src/core/ext/filters/client_channel/lb_policy/backend_metric_data.h"
 #include "src/core/lib/resolver/server_address.h"