Replacing WebUIBindings use of CPPBoundClass with v8::Extension.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 60dbc73d59f04ee3fbb02ef76c85cbfee154357f..0c152e3cff510005521a0e8714983b6ff24a1f71 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -67,6 +67,7 @@
 #include "content/renderer/render_process_impl.h"
 #include "content/renderer/render_view_impl.h"
 #include "content/renderer/renderer_webkitplatformsupport_impl.h"
+#include "content/renderer/web_ui_extension.h"
 #include "grit/content_resources.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_forwarding_message_filter.h"
@@ -316,6 +317,8 @@ void RenderThreadImpl::Init() {
 
   GetContentClient()->renderer()->RenderThreadStarted();
 
+  RegisterExtension(content::WebUIExtension::Get());
+
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kEnableGpuBenchmarking))
       RegisterExtension(GpuBenchmarkingExtension::Get());