<webview>: Change how plugin load works inside guests.

chrome/browser/guestview/webview/webview_guest.cc

Index: chrome/browser/guestview/webview/webview_guest.cc
diff --git a/chrome/browser/guestview/webview/webview_guest.cc b/chrome/browser/guestview/webview/webview_guest.cc
index e0ee6a0debee88d014fa86d30b832244d6e0d93b..273a49fab1178624bc0b12f8208f8df6305eb599 100644
--- a/chrome/browser/guestview/webview/webview_guest.cc
+++ b/chrome/browser/guestview/webview/webview_guest.cc
@@ -26,6 +26,10 @@
 #include "content/public/common/result_codes.h"
 #include "net/base/net_errors.h"
 
+#if defined(ENABLE_PLUGINS)
+#include "chrome/browser/guestview/webview/plugin_permission_helper.h"
+#endif
+
 using content::WebContents;
 
 namespace {
@@ -62,8 +66,9 @@ static std::string PermissionTypeToString(BrowserPluginPermissionType type) {
       return webview::kPermissionTypePointerLock;
     case BROWSER_PLUGIN_PERMISSION_TYPE_JAVASCRIPT_DIALOG:
       return webview::kPermissionTypeDialog;
+    case BROWSER_PLUGIN_PERMISSION_TYPE_LOAD_PLUGIN:
+      return webview::kPermissionTypeLoadPlugin;
     case BROWSER_PLUGIN_PERMISSION_TYPE_UNKNOWN:
-    default:
       NOTREACHED();
       break;
   }
@@ -85,6 +90,9 @@ void RemoveWebViewEventListenersOnIOThread(
 
 void AttachWebViewHelpers(WebContents* contents) {
   FaviconTabHelper::CreateForWebContents(contents);
+#if defined(ENABLE_PLUGINS)
+  PluginPermissionHelper::CreateForWebContents(contents);
+#endif
 }
 
 }  // namespace