Introduce WebPluginContainerBase to abstract WebPluginContainerImpl.

third_party/WebKit/Source/web/ChromeClientImpl.cpp

Index: third_party/WebKit/Source/web/ChromeClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/ChromeClientImpl.cpp b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
index bd26c8f111d096fd0499666de9c8e752dbbc304d..c79411f624b46d380f2a21a996ae61368df5c3d1 100644
--- a/third_party/WebKit/Source/web/ChromeClientImpl.cpp
+++ b/third_party/WebKit/Source/web/ChromeClientImpl.cpp
@@ -41,6 +41,7 @@
 #include "core/events/UIEventWithKeyState.h"
 #include "core/events/WebInputEventConversion.h"
 #include "core/exported/WebFileChooserCompletionImpl.h"
+#include "core/exported/WebPluginContainerBase.h"
 #include "core/exported/WebViewBase.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/Settings.h"
@@ -122,7 +123,6 @@
 #include "web/PopupMenuImpl.h"
 #include "web/WebFrameWidgetImpl.h"
 #include "web/WebLocalFrameImpl.h"
-#include "web/WebPluginContainerImpl.h"
 #include "web/WebRemoteFrameImpl.h"
 #include "web/WebSettingsImpl.h"
 
@@ -658,8 +658,8 @@ void ChromeClientImpl::ShowMouseOverURL(const HitTestResult& result) {
       if (object && object->IsLayoutPart()) {
         PluginView* plugin_view = ToLayoutPart(object)->Plugin();
         if (plugin_view && plugin_view->IsPluginContainer()) {
-          WebPluginContainerImpl* plugin =
-              ToWebPluginContainerImpl(plugin_view);
+          WebPluginContainerBase* plugin =
+              ToWebPluginContainerBase(plugin_view);
           url = plugin->Plugin()->LinkAtPosition(
               result.RoundedPointInInnerNodeFrame());
         }