Use the WebKit default fonts when specifying generic font families.

ppapi/proxy/host_dispatcher.cc

Index: ppapi/proxy/host_dispatcher.cc
===================================================================
--- ppapi/proxy/host_dispatcher.cc	(revision 86427)
+++ ppapi/proxy/host_dispatcher.cc	(working copy)
@@ -92,9 +92,11 @@
 bool HostDispatcher::InitHostWithChannel(
     Delegate* delegate,
     const IPC::ChannelHandle& channel_handle,
-    bool is_client) {
+    bool is_client,
+    const ppapi::Preferences& preferences) {
   if (!Dispatcher::InitWithChannel(delegate, channel_handle, is_client))
     return false;
+  Send(new PpapiMsg_SetPreferences(preferences));
   return true;
 }