Remove rendundant WebLocalFrame parameter in various plugin code.

chrome/renderer/plugins/plugin_preroller.h

Index: chrome/renderer/plugins/plugin_preroller.h
diff --git a/chrome/renderer/plugins/plugin_preroller.h b/chrome/renderer/plugins/plugin_preroller.h
index 802e9c442eaab88bab5fd4855bee2beb89eee134..c6e8bfb712bb44b3a45e1b1348f3ccbdeebcd201 100644
--- a/chrome/renderer/plugins/plugin_preroller.h
+++ b/chrome/renderer/plugins/plugin_preroller.h
@@ -12,10 +12,6 @@
 #include "third_party/WebKit/public/web/WebPluginParams.h"
 #include "url/gurl.h"
 
-namespace blink {
-class WebLocalFrame;
-}
-
 class SkBitmap;
 
 // This class manages a plugin briefly for the purposes of keyframe extraction.
@@ -25,9 +21,8 @@ class SkBitmap;
 class PluginPreroller : public content::PluginInstanceThrottler::Observer,
                         public content::RenderFrameObserver {
  public:
-  // Does not take ownership of either |plugin| or |throttler|.
+  // Does not take ownership of |render_frame|, |plugin|, or |throttler|.
   PluginPreroller(content::RenderFrame* render_frame,
-                  blink::WebLocalFrame* frame,
                   const blink::WebPluginParams& params,
                   const content::WebPluginInfo& info,
                   const std::string& identifier,
@@ -46,7 +41,6 @@ class PluginPreroller : public content::PluginInstanceThrottler::Observer,
   // content::RenderFrameObserver implementation.
   void OnDestruct() override;
 
-  blink::WebLocalFrame* frame_;
   blink::WebPluginParams params_;
   content::WebPluginInfo info_;
   std::string identifier_;