Remove unused SignalMediaError and infrastructure.

talk/media/base/videoengine_unittest.h

Index: talk/media/base/videoengine_unittest.h
diff --git a/talk/media/base/videoengine_unittest.h b/talk/media/base/videoengine_unittest.h
index 3f02055555921641bcfa2ae93c3c0c77af90859a..74f6294f42806f9fd0fd06fc49f2bdda01e995d9 100644
--- a/talk/media/base/videoengine_unittest.h
+++ b/talk/media/base/videoengine_unittest.h
@@ -465,7 +465,6 @@ class VideoMediaChannelTest : public testing::Test,
     channel_.reset(
         engine_.CreateChannel(call_.get(), cricket::VideoOptions()));
     EXPECT_TRUE(channel_.get() != NULL);
-    ConnectVideoChannelError();
     network_interface_.SetDestination(channel_.get());
     channel_->SetInterface(&network_interface_);
     media_error_ = cricket::VideoMediaChannel::ERROR_NONE;
@@ -520,10 +519,6 @@ class VideoMediaChannelTest : public testing::Test,
   virtual void TearDown() {
     channel_.reset();
   }
-  void ConnectVideoChannelError() {
-    channel_->SignalMediaError.connect(this,
-        &VideoMediaChannelTest<E, C>::OnVideoChannelError);
-  }
   bool SetDefaultCodec() {
     return SetOneCodec(DefaultCodec());
   }