Revert of Add task queue to Call.

webrtc/call/call_perf_tests.cc

Index: webrtc/call/call_perf_tests.cc
diff --git a/webrtc/call/call_perf_tests.cc b/webrtc/call/call_perf_tests.cc
index 81fbdb7d49f9a5ec28d50b60382a73191de9098d..12cafd9582faff91ce53c4db013d9655579c98fe 100644
--- a/webrtc/call/call_perf_tests.cc
+++ b/webrtc/call/call_perf_tests.cc
@@ -672,7 +672,7 @@
       encoder_config->streams[0].target_bitrate_bps =
           encoder_config->streams[0].max_bitrate_bps = 2000000;
 
-      encoder_config_ = encoder_config->Copy();
+      encoder_config_ = *encoder_config;
     }
 
     void OnVideoStreamsCreated(
@@ -686,7 +686,7 @@
           << "Timed out before receiving an initial high bitrate.";
       encoder_config_.streams[0].width *= 2;
       encoder_config_.streams[0].height *= 2;
-      send_stream_->ReconfigureVideoEncoder(encoder_config_.Copy());
+      send_stream_->ReconfigureVideoEncoder(encoder_config_);
       EXPECT_TRUE(Wait())
           << "Timed out while waiting for a couple of high bitrate estimates "
              "after reconfiguring the send stream.";