voice_engine: Removed old variants of Channel constructor and CreateChannel

webrtc/voice_engine/channel_manager.h

Index: webrtc/voice_engine/channel_manager.h
diff --git a/webrtc/voice_engine/channel_manager.h b/webrtc/voice_engine/channel_manager.h
index c59ee5dc976f276b400e41c008f9f837409c41b3..adc9d901f1651596accf1fade0dcec09b62a4fd9 100644
--- a/webrtc/voice_engine/channel_manager.h
+++ b/webrtc/voice_engine/channel_manager.h
@@ -97,11 +97,9 @@ class ChannelManager {
 
   // CreateChannel will always return a valid ChannelOwner instance. The channel
   // is created either based on internal configuration, i.e. |config_|, by
-  // calling CreateChannel(), or using and external configuration
+  // calling CreateChannel(...), or using and external configuration
   // |external_config| if the overloaded method
-  // CreateChannel(const Config& external_config) is called.
-  ChannelOwner CreateChannel();
-  ChannelOwner CreateChannel(const Config& external_config);
+  // CreateChannel(const Config& external_config, ...) is called.
   ChannelOwner CreateChannel(
       const rtc::scoped_refptr<AudioDecoderFactory>& decoder_factory);
   ChannelOwner CreateChannel(