Create a valid RendererPreferences for notification windows.

Essentially the same fix as http://crrev.com/44709.

BUG=140177
TEST=Select text in a notification and verify it to be highlighted.

Review URL: https://chromiumcodereview.appspot.com/10825150

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150236 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/notifications/balloon_host.cc

@@ -138,6 +138,9 @@ void BalloonHost::Init() {
   chrome::SetViewType(web_contents_.get(), chrome::VIEW_TYPE_NOTIFICATION);
   web_contents_->SetDelegate(this);
   Observe(web_contents_.get());
+  renderer_preferences_util::UpdateFromSystemSettings(
+      web_contents_->GetMutableRendererPrefs(), balloon_->profile());
+  web_contents_->GetRenderViewHost()->SyncRendererPrefs();
 
   web_contents_->GetController().LoadURL(
       balloon_->notification().content_url(), content::Referrer(),