Revert 96981 - Add PluginMessageLoopProxy and use it for Host plugin UI thread.

remoting/host/chromoting_host_context_unittest.cc

Index: remoting/host/chromoting_host_context_unittest.cc
===================================================================
--- remoting/host/chromoting_host_context_unittest.cc	(revision 96983)
+++ remoting/host/chromoting_host_context_unittest.cc	(working copy)
@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 #include "base/message_loop.h"
-#include "base/message_loop_proxy.h"
 #include "remoting/host/chromoting_host_context.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -12,10 +11,7 @@
 // A simple test that starts and stop the context. This tests the context
 // operates properly and all threads and message loops are valid.
 TEST(ChromotingHostContextTest, StartAndStop) {
-  MessageLoop message_loop;
-  ChromotingHostContext context(
-      base::MessageLoopProxy::CreateForCurrentThread());
-
+  ChromotingHostContext context;
   context.Start();
   EXPECT_TRUE(context.jingle_thread());
   EXPECT_TRUE(context.main_message_loop());