Remove implicit conversions from scoped_refptr to T* in mojo/

mojo/system/channel_unittest.cc

Index: mojo/system/channel_unittest.cc
diff --git a/mojo/system/channel_unittest.cc b/mojo/system/channel_unittest.cc
index 0f6c7745ca521c3ded1da820e542c90387999a9b..dbb7de8f4f7bc373c93cd9f7ceca47e82ae21788 100644
--- a/mojo/system/channel_unittest.cc
+++ b/mojo/system/channel_unittest.cc
@@ -50,7 +50,7 @@ class ChannelTest : public testing::Test {
     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()));
@@ -59,7 +59,7 @@ class ChannelTest : public testing::Test {
   void ShutdownChannelOnIOThread() {
     CHECK_EQ(base::MessageLoop::current(), io_thread()->message_loop());
 
-    CHECK(channel_);
+    CHECK(channel_.get());
     channel_->Shutdown();
   }