BrowserPluginGuest/Embedder: Remove friend helper classes, made necessary calls public

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index 374deec1ecc28b5ac3ede27f9ac94a7a8ef00eda..331f0d21381298ad1d7ff12e185ba38efecf1f23 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -73,6 +73,10 @@ void BrowserPluginGuest::RendererUnresponsive(WebContents* source) {
   base::KillProcess(process_handle, RESULT_CODE_HUNG, false);
 }
 
+WebContents* BrowserPluginGuest::GetWebContents() {
+  return web_contents();
+}
+
 void BrowserPluginGuest::SetDamageBuffer(
     TransportDIB* damage_buffer,
 #if defined(OS_WIN)