[HBD] Remove PluginCache and reload plugin list when origin changes

content/renderer/renderer_blink_platform_impl.cc

Index: content/renderer/renderer_blink_platform_impl.cc
diff --git a/content/renderer/renderer_blink_platform_impl.cc b/content/renderer/renderer_blink_platform_impl.cc
index 376d3a0c68a4eac8be7a2e5db04df70522f1697e..ffc9c36bd505ea04b0654c021a96af1f9cc6e625 100644
--- a/content/renderer/renderer_blink_platform_impl.cc
+++ b/content/renderer/renderer_blink_platform_impl.cc
@@ -805,12 +805,15 @@ blink::WebMIDIAccessor* RendererBlinkPlatformImpl::createMIDIAccessor(
 
 void RendererBlinkPlatformImpl::getPluginList(
     bool refresh,
+    const blink::WebSecurityOrigin* origin,
     blink::WebPluginListBuilder* builder) {
 #if defined(ENABLE_PLUGINS)
   std::vector<WebPluginInfo> plugins;
   if (!plugin_refresh_allowed_)
     refresh = false;
-  RenderThread::Get()->Send(new FrameHostMsg_GetPlugins(refresh, &plugins));
+  url::Origin main_frame_origin = origin ? url::Origin(*origin) : url::Origin();

[alexmos, 2016/08/02 22:06:28]

Is getPluginMimeTypeFromExtension the only reason why origin might be null? 
Maybe it's better to just pass a unique origin directly from there, which would
avoid the conditional here and let you pass the origin as a const ref.

[trizzofo, 2016/08/03 00:08:37]

Yes, getPluginMimeTypeFromExtension was the only reason. Changed it so it passes
a const ref. Thanks for the suggestion!

+  RenderThread::Get()->Send(
+      new FrameHostMsg_GetPlugins(refresh, main_frame_origin, &plugins));
   for (const WebPluginInfo& plugin : plugins) {
     builder->addPlugin(
         plugin.name, plugin.desc,