Remove rendundant WebLocalFrame parameter in various plugin code.

content/shell/test_runner/web_test_delegate.h

Index: content/shell/test_runner/web_test_delegate.h
diff --git a/content/shell/test_runner/web_test_delegate.h b/content/shell/test_runner/web_test_delegate.h
index f9be6b8104a0ea18246c5884353d236ccb9968ff..845889ce6da1c1c026341f248e1a5a7556152f28 100644
--- a/content/shell/test_runner/web_test_delegate.h
+++ b/content/shell/test_runner/web_test_delegate.h
@@ -285,7 +285,6 @@ class WebTestDelegate {
       const std::string& platform) = 0;
 
   virtual blink::WebPlugin* CreatePluginPlaceholder(
-      blink::WebLocalFrame* frame,
       const blink::WebPluginParams& params) = 0;
 
   virtual float GetDeviceScaleFactor() const = 0;
@@ -301,6 +300,9 @@ class WebTestDelegate {
   // Indicates if the navigation was initiated by the browser or renderer.
   virtual bool IsNavigationInitiatedByRenderer(
       const blink::WebURLRequest& request) = 0;
+
+ protected:
+  virtual ~WebTestDelegate() {}
 };
 
 }  // namespace test_runner