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diff --git a/runtime/lambda/closure_builder.h b/runtime/lambda/closure_builder.h
deleted file mode 100644
index 23eb484529..0000000000
--- a/runtime/lambda/closure_builder.h
+++ /dev/null
@@ -1,104 +0,0 @@
-/*
- * Copyright (C) 2015 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-#ifndef ART_RUNTIME_LAMBDA_CLOSURE_BUILDER_H_
-#define ART_RUNTIME_LAMBDA_CLOSURE_BUILDER_H_
-
-#include "base/macros.h"
-#include "base/mutex.h"  // For Locks::mutator_lock_.
-#include "base/value_object.h"
-#include "lambda/shorty_field_type.h"
-
-#include <stdint.h>
-#include <vector>
-
-namespace art {
-class ArtMethod;  // forward declaration
-
-namespace mirror {
-class Object;  // forward declaration
-}  // namespace mirror
-
-namespace lambda {
-class ArtLambdaMethod;  // forward declaration
-
-// Build a closure by capturing variables one at a time.
-// When all variables have been marked captured, the closure can be created in-place into
-// a target memory address.
-//
-// The mutator lock must be held for the duration of the lifetime of this object,
-// since it needs to temporarily store heap references into an internal list.
-class ClosureBuilder {
- public:
-  using ShortyTypeEnum = decltype(ShortyFieldType::kByte);
-
-  // Mark this primitive value to be captured as the specified type.
-  template <typename T, ShortyTypeEnum kShortyType = ShortyFieldTypeSelectEnum<T>::value>
-  void CaptureVariablePrimitive(T value);
-
-  // Mark this object reference to be captured.
-  void CaptureVariableObject(mirror::Object* object) SHARED_REQUIRES(Locks::mutator_lock_);
-
-  // Mark this lambda closure to be captured.
-  void CaptureVariableLambda(Closure* closure);
-
-  // Get the size (in bytes) of the closure.
-  // This size is used to be able to allocate memory large enough to write the closure into.
-  // Call 'CreateInPlace' to actually write the closure out.
-  size_t GetSize() const;
-
-  // Returns how many variables have been captured so far.
-  size_t GetCaptureCount() const;
-
-  // Get the list of captured variables' shorty field types.
-  const std::string& GetCapturedVariableShortyTypes() const;
-
-  // Creates a closure in-place and writes out the data into 'memory'.
-  // Memory must be at least 'GetSize' bytes large.
-  // All previously marked data to be captured is now written out.
-  Closure* CreateInPlace(void* memory, ArtLambdaMethod* target_method) const
-      SHARED_REQUIRES(Locks::mutator_lock_);
-
-  // Locks need to be held for entire lifetime of ClosureBuilder.
-  ClosureBuilder() SHARED_REQUIRES(Locks::mutator_lock_)
-  {}
-
-  // Locks need to be held for entire lifetime of ClosureBuilder.
-  ~ClosureBuilder() SHARED_REQUIRES(Locks::mutator_lock_)
-  {}
-
- private:
-  // Initial size a closure starts out before any variables are written.
-  // Header size only.
-  static constexpr size_t kInitialSize = sizeof(ArtLambdaMethod*);
-
-  // Write a Closure's variables field from the captured variables.
-  // variables_size specified in bytes, and only includes enough room to write variables into.
-  // Returns the calculated actual size of the closure.
-  size_t WriteValues(ArtLambdaMethod* target_method,
-                     uint8_t variables[],
-                     size_t header_size,
-                     size_t variables_size) const SHARED_REQUIRES(Locks::mutator_lock_);
-
-  size_t size_ = kInitialSize;
-  bool is_dynamic_size_ = false;
-  std::vector<ShortyFieldTypeTraits::MaxType> values_;
-  std::string shorty_types_;
-};
-
-}  // namespace lambda
-}  // namespace art
-
-#endif  // ART_RUNTIME_LAMBDA_CLOSURE_BUILDER_H_