Make the Pepper proxy support in-process font rendering.

content/common/pepper_plugin_registry.cc

Index: content/common/pepper_plugin_registry.cc
===================================================================
--- content/common/pepper_plugin_registry.cc	(revision 84549)
+++ content/common/pepper_plugin_registry.cc	(working copy)
@@ -232,5 +232,13 @@
 
 std::set<PP_Instance>* PepperPluginRegistry::GetGloballySeenInstanceIDSet() {
   // This function is not needed on the host side of the proxy.
+  NOTREACHED();
   return NULL;
 }
+
+void PepperPluginRegistry::PostToWebKitThread(
+    const tracked_objects::Location& from_here,
+    const base::Closure& task) {
+  // This function is not needed on the host side of the proxy.
+  NOTREACHED();
+}