PPAPI: Never re-enter JavaScript for PostMessage.

ppapi/proxy/ppapi_proxy_test.cc

Index: ppapi/proxy/ppapi_proxy_test.cc
diff --git a/ppapi/proxy/ppapi_proxy_test.cc b/ppapi/proxy/ppapi_proxy_test.cc
index 81793d5c174239920d52c7458d7dc0843b258903..5da40044d19aff6729c81c66735ab1fe3c213d4e 100644
--- a/ppapi/proxy/ppapi_proxy_test.cc
+++ b/ppapi/proxy/ppapi_proxy_test.cc
@@ -12,6 +12,7 @@
 #include "base/observer_list.h"
 #include "base/run_loop.h"
 #include "ipc/ipc_sync_channel.h"
+#include "ipc/message_filter.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/private/ppb_proxy_private.h"
 #include "ppapi/proxy/ppapi_messages.h"
@@ -407,16 +408,8 @@ void PluginProxyMultiThreadTest::InternalSetUpTestOnSecondaryThread(
 
 // HostProxyTestHarness --------------------------------------------------------
 
-class HostProxyTestHarness::MockSyncMessageStatusReceiver
-    : public HostDispatcher::SyncMessageStatusReceiver {
- public:
-  virtual void BeginBlockOnSyncMessage() OVERRIDE {}
-  virtual void EndBlockOnSyncMessage() OVERRIDE {}
-};
-
 HostProxyTestHarness::HostProxyTestHarness(GlobalsConfiguration globals_config)
-    : globals_config_(globals_config),
-      status_receiver_(new MockSyncMessageStatusReceiver) {
+    : globals_config_(globals_config) {
 }
 
 HostProxyTestHarness::~HostProxyTestHarness() {
@@ -437,7 +430,7 @@ void HostProxyTestHarness::SetUpHarness() {
   host_dispatcher_.reset(new HostDispatcher(
       pp_module(),
       &MockGetInterface,
-      status_receiver_.release(),
+      scoped_refptr<IPC::MessageFilter>(new IPC::MessageFilter()),
       PpapiPermissions::AllPermissions()));
   host_dispatcher_->InitWithTestSink(&sink());
   HostDispatcher::SetForInstance(pp_instance(), host_dispatcher_.get());
@@ -456,7 +449,7 @@ void HostProxyTestHarness::SetUpHarnessWithChannel(
   host_dispatcher_.reset(new HostDispatcher(
       pp_module(),
       &MockGetInterface,
-      status_receiver_.release(),
+      scoped_refptr<IPC::MessageFilter>(new IPC::MessageFilter()),
       PpapiPermissions::AllPermissions()));
   ppapi::Preferences preferences;
   host_dispatcher_->InitHostWithChannel(&delegate_mock_,