Introduce WebPluginContainerBase to abstract WebPluginContainerImpl.

third_party/WebKit/Source/web/WebPluginDocument.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "public/web/WebPluginDocument.h"
 
 #include "core/dom/Document.h"
+#include "core/exported/WebPluginContainerBase.h"
 #include "core/html/PluginDocument.h"
-
-#include "web/WebPluginContainerImpl.h"
-
 #include "platform/wtf/PassRefPtr.h"
 
 namespace blink {
 
 WebPlugin* WebPluginDocument::Plugin() {
   if (!IsPluginDocument())
     return 0;
   PluginDocument* doc = Unwrap<PluginDocument>();
-  WebPluginContainerImpl* container =
-      ToWebPluginContainerImpl(doc->GetPluginView());
-  return container ? container->Plugin() : 0;
+  WebPluginContainerBase* container =
+      ToWebPluginContainerBase(doc->GetPluginView());
+  return container ? container->Plugin() : nullptr;
 }
 
 WebPluginDocument::WebPluginDocument(PluginDocument* elem)
     : WebDocument(elem) {}
 
 DEFINE_WEB_NODE_TYPE_CASTS(WebPluginDocument,
                            IsDocumentNode() &&
                                ConstUnwrap<Document>()->IsPluginDocument());
 
 WebPluginDocument& WebPluginDocument::operator=(PluginDocument* elem) {
   private_ = elem;
   return *this;
 }
 
 WebPluginDocument::operator PluginDocument*() const {
   return static_cast<PluginDocument*>(private_.Get());
 }
 
 }  // namespace blink