Revert of Introduce WebPluginContainerBase to abstract WebPluginContainerImpl.

third_party/WebKit/Source/core/exported/WebPluginContainerBase.cpp

Index: third_party/WebKit/Source/core/exported/WebPluginContainerBase.cpp
diff --git a/third_party/WebKit/Source/core/exported/WebPluginContainerBase.cpp b/third_party/WebKit/Source/core/exported/WebPluginContainerBase.cpp
deleted file mode 100644
index 8b8f591f72d30fd4c97d64557df0a7dabebf28a8..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/exported/WebPluginContainerBase.cpp
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2017 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 WebViewBase_h
-
-#include "core/exported/WebPluginContainerBase.h"
-
-namespace blink {
-
-WebPluginContainerBase::WebPluginContainerBase(LocalFrame* frame)
-    : ContextClient(frame) {}
-
-DEFINE_TRACE(WebPluginContainerBase) {
-  ContextClient::Trace(visitor);
-  PluginView::Trace(visitor);
-}
-
-}  // namespace blink