Remove unneeded extension_messages_browsertest.cc + cleanup.

chrome/renderer/extensions/extension_request_sender.cc

Index: chrome/renderer/extensions/extension_request_sender.cc
diff --git a/chrome/renderer/extensions/extension_request_sender.cc b/chrome/renderer/extensions/extension_request_sender.cc
index a7e5b98df7d45e24c93973287a3ed5303474dcfa..6ec3beefca7455150926e999f7cfe4845fdbb724 100644
--- a/chrome/renderer/extensions/extension_request_sender.cc
+++ b/chrome/renderer/extensions/extension_request_sender.cc
@@ -97,12 +97,12 @@ void ExtensionRequestSender::StartRequest(
       v8::Persistent<v8::Context>::New(v8::Context::GetCurrent());
   DCHECK(!v8_context.IsEmpty());
   InsertRequest(request_id, new PendingRequest(
-      v8_context, name, current_context->extension_id()));
+      v8_context, name, current_context->GetExtensionID()));
 
   ExtensionHostMsg_Request_Params params;
   params.name = name;
   params.arguments.Swap(value_args);
-  params.extension_id = current_context->extension_id();
+  params.extension_id = current_context->GetExtensionID();
   params.source_url = source_url;
   params.source_origin = source_origin.toString();
   params.request_id = request_id;