Remove IUnknownImpl

All uses have been removed in favor of Microsoft::WRL::RuntimeClass.

Fixed:1014283
TBR=gab@chromium.org
Trivial //base/BUILD.gn change.

Change-Id: Id31e464c30d59958a7ac5524217ac9b685f4b077
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863110
Commit-Queue: Robert Liao <robliao@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706566}

base/BUILD.gn

@@ -1074,8 +1074,6 @@ jumbo_component("base") {
     "win/i18n.h",
     "win/iat_patch_function.cc",
     "win/iat_patch_function.h",
-    "win/iunknown_impl.cc",
-    "win/iunknown_impl.h",
     "win/map.h",
     "win/message_window.cc",
     "win/message_window.h",
@@ -2831,7 +2829,6 @@ test("base_unittests") {
     "win/hstring_compare_unittest.cc",
     "win/hstring_reference_unittest.cc",
     "win/i18n_unittest.cc",
-    "win/iunknown_impl_unittest.cc",
     "win/map_unittest.cc",
     "win/message_window_unittest.cc",
     "win/object_watcher_unittest.cc",

base/win/iunknown_impl.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/win/iunknown_impl.h"
-
-namespace base {
-namespace win {
-
-IUnknownImpl::IUnknownImpl()
-    : ref_count_(0) {
-}
-
-IUnknownImpl::~IUnknownImpl() {
-}
-
-ULONG STDMETHODCALLTYPE IUnknownImpl::AddRef() {
-  ref_count_.Increment();
-  return 1;
-}
-
-ULONG STDMETHODCALLTYPE IUnknownImpl::Release() {
-  if (!ref_count_.Decrement()) {
-    delete this;
-    return 0;
-  }
-  return 1;
-}
-
-STDMETHODIMP IUnknownImpl::QueryInterface(REFIID riid, void** ppv) {
-  if (riid == IID_IUnknown) {
-    *ppv = static_cast<IUnknown*>(this);
-    AddRef();
-    return S_OK;
-  }
-
-  *ppv = NULL;
-  return E_NOINTERFACE;
-}
-
-}  // namespace win
-}  // namespace base

base/win/iunknown_impl.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef BASE_WIN_IUNKNOWN_IMPL_H_
-#define BASE_WIN_IUNKNOWN_IMPL_H_
-
-#include <unknwn.h>
-
-#include "base/atomic_ref_count.h"
-#include "base/base_export.h"
-#include "base/compiler_specific.h"
-
-namespace base {
-namespace win {
-
-// IUnknown implementation for other classes to derive from.
-class BASE_EXPORT IUnknownImpl : public IUnknown {
- public:
-  IUnknownImpl();
-
-  ULONG STDMETHODCALLTYPE AddRef() override;
-  ULONG STDMETHODCALLTYPE Release() override;
-
-  // Subclasses should extend this to return any interfaces they provide.
-  STDMETHODIMP QueryInterface(REFIID riid, void** ppv) override;
-
- protected:
-  virtual ~IUnknownImpl();
-
- private:
-  AtomicRefCount ref_count_;
-};
-
-}  // namespace win
-}  // namespace base
-
-#endif  // BASE_WIN_IUNKNOWN_IMPL_H_

base/win/iunknown_impl_unittest.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/win/iunknown_impl.h"
-
-#include "base/win/scoped_com_initializer.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace base {
-namespace win {
-
-class TestIUnknownImplSubclass : public IUnknownImpl {
- public:
-  TestIUnknownImplSubclass() {
-    ++instance_count;
-  }
-  ~TestIUnknownImplSubclass() override { --instance_count; }
-  static int instance_count;
-};
-
-// static
-int TestIUnknownImplSubclass::instance_count = 0;
-
-TEST(IUnknownImplTest, IUnknownImpl) {
-  ScopedCOMInitializer com_initializer;
-
-  EXPECT_EQ(0, TestIUnknownImplSubclass::instance_count);
-  IUnknown* u = new TestIUnknownImplSubclass();
-
-  EXPECT_EQ(1, TestIUnknownImplSubclass::instance_count);
-
-  EXPECT_EQ(1u, u->AddRef());
-  EXPECT_EQ(1u, u->AddRef());
-
-  IUnknown* other = NULL;
-  EXPECT_EQ(E_NOINTERFACE, u->QueryInterface(
-      IID_IDispatch, reinterpret_cast<void**>(&other)));
-  EXPECT_EQ(S_OK, u->QueryInterface(
-      IID_IUnknown, reinterpret_cast<void**>(&other)));
-  other->Release();
-
-  EXPECT_EQ(1u, u->Release());
-  EXPECT_EQ(0u, u->Release());
-  EXPECT_EQ(0, TestIUnknownImplSubclass::instance_count);
-}
-
-}  // namespace win
-}  // namespace base