Revert "Introduce unload method API to Module. (#13364)"

This reverts commit 1d5a214.

Author: manuelcandales

extension/apple/ExecuTorch/Exported/ExecuTorchModule.h

@@ -187,14 +187,6 @@ __attribute__((deprecated("This API is experimental.")))
  */
 - (BOOL)isMethodLoaded:(NSString *)methodName NS_SWIFT_NAME(isLoaded(_:));
 
-/**
- * Unloads a method and releases its native resources and planned buffers.
- *
- * @param methodName The method to unload.
- * @return YES if the method was unloaded; NO if it was not loaded at all.
- */
-- (BOOL)unloadMethod:(NSString *)methodName NS_SWIFT_NAME(unload(_:));
-
 /**
  * Retrieves the set of method names available in the loaded program.
  *

extension/apple/ExecuTorch/Exported/ExecuTorchModule.mm

@@ -300,13 +300,6 @@ - (BOOL)isMethodLoaded:(NSString *)methodName {
   return _module->is_method_loaded(methodName.UTF8String);
 }
 
-- (BOOL)unloadMethod:(NSString *)methodName {
-  const auto didUnload = _module->unload_method(methodName.UTF8String);
-  [_inputs removeObjectForKey:methodName];
-  [_outputs removeObjectForKey:methodName];
-  return didUnload;
-}
-
 - (nullable NSSet<NSString *> *)methodNames:(NSError **)error {
   const auto result = _module->method_names();
   if (!result.ok()) {

extension/apple/ExecuTorch/__tests__/ModuleTest.swift

@@ -149,26 +149,4 @@ class ModuleTest: XCTestCase {
     XCTAssertEqual(methodMetadata.backendNames.count, 0)
     XCTAssertEqual(methodMetadata.instructionCount, 1)
   }
-
-  func testUnloadMethod() {
-    guard let modelPath = resourceBundle.path(forResource: "add", ofType: "pte") else {
-      XCTFail("Couldn't find the model file")
-      return
-    }
-    let module = Module(filePath: modelPath)
-    XCTAssertNoThrow(try module.load("forward"))
-    XCTAssertTrue(module.isLoaded("forward"))
-
-    XCTAssertNoThrow(try module.setInputs(Tensor<Float>([1]), Tensor<Float>([2])))
-    XCTAssertEqual(try module.forward(), Tensor<Float>([3]))
-
-    XCTAssertTrue(module.unload("forward"))
-    XCTAssertFalse(module.isLoaded("forward"))
-    XCTAssertFalse(module.unload("forward"))
-
-    XCTAssertThrowsError(try module.forward())
-    XCTAssertTrue(module.isLoaded("forward"))
-    XCTAssertNoThrow(try module.setInputs(Tensor<Float>([2]), Tensor<Float>([3])))
-    XCTAssertEqual(try module.forward(), Tensor<Float>([5]))
-  }
 }