Update to Chromium revision 318e6f54 (#400326)

libcef/renderer/plugins/cef_plugin_placeholder.cc

@@ -58,7 +58,6 @@ CefPluginPlaceholder::CefPluginPlaceholder(
                                          html_data),
       status_(CefViewHostMsg_GetPluginInfo_Status::kAllowed),
       title_(title),
-      has_host_(false),
       context_menu_request_id_(0),
       ignore_updates_(false) {
   RenderThread::Get()->AddObserver(this);

libcef/renderer/plugins/cef_plugin_placeholder.h

@@ -82,7 +82,6 @@ class CefPluginPlaceholder final
 
   base::string16 title_;
 
-  bool has_host_;
   int context_menu_request_id_;  // Nonzero when request pending.
   base::string16 plugin_name_;
 

libcef/renderer/plugins/plugin_preroller.cc

@@ -91,3 +91,7 @@ void CefPluginPreroller::OnThrottlerDestroyed() {
   throttler_ = nullptr;
   delete this;
 }
+
+void CefPluginPreroller::OnDestruct() {
+  delete this;
+}

libcef/renderer/plugins/plugin_preroller.h

@@ -44,6 +44,9 @@ class CefPluginPreroller : public content::PluginInstanceThrottler::Observer,
   void OnThrottleStateChange() override;
   void OnThrottlerDestroyed() override;
 
+  // content::RenderFrameObserver implementation.
+  void OnDestruct() override;
+
   blink::WebLocalFrame* frame_;
   blink::WebPluginParams params_;
   content::WebPluginInfo info_;