Remove implicit conversions from scoped_refptr to T* in mojo/

mojo/system/channel_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/system/channel.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/message_loop/message_loop.h"
 #include "mojo/embedder/platform_channel_pair.h"
@@ skipping 32 matching lines @@
 
   void CreateChannelOnIOThread() {
     CHECK_EQ(base::MessageLoop::current(), io_thread()->message_loop());
     channel_ = new Channel(&platform_support_);
   }
 
   void InitChannelOnIOThread() {
     CHECK_EQ(base::MessageLoop::current(), io_thread()->message_loop());
 
     CHECK(raw_channel_);
-    CHECK(channel_);
+    CHECK(channel_.get());
     CHECK_EQ(init_result_, TRISTATE_UNKNOWN);
 
     init_result_ = BoolToTristate(channel_->Init(raw_channel_.Pass()));
   }
 
   void ShutdownChannelOnIOThread() {
     CHECK_EQ(base::MessageLoop::current(), io_thread()->message_loop());
 
-    CHECK(channel_);
+    CHECK(channel_.get());
     channel_->Shutdown();
   }
 
   test::TestIOThread* io_thread() { return &io_thread_; }
   RawChannel* raw_channel() { return raw_channel_.get(); }
   scoped_ptr<RawChannel>* mutable_raw_channel() { return &raw_channel_; }
   Channel* channel() { return channel_.get(); }
   scoped_refptr<Channel>* mutable_channel() { return &channel_; }
   Tristate init_result() const { return init_result_; }
 
@@ skipping 240 matching lines @@
   mp->Close(0);
 
   EXPECT_TRUE(channel()->HasOneRef());
 }
 
 // TODO(vtl): More. ------------------------------------------------------------
 
 }  // namespace
 }  // namespace system
 }  // namespace mojo