Add includes back to channel_info.h.

mojo/edk/system/channel_info.h

Index: mojo/edk/system/channel_info.h
diff --git a/mojo/edk/system/channel_info.h b/mojo/edk/system/channel_info.h
index ea920175f20907ba30fe5ad8ab7396dc84c1d966..5167cca35e0fc4076f25dc55d1d3db0b0b216011 100644
--- a/mojo/edk/system/channel_info.h
+++ b/mojo/edk/system/channel_info.h
@@ -6,17 +6,13 @@
 #define MOJO_EDK_SYSTEM_CHANNEL_INFO_H_
 
 #include "base/memory/ref_counted.h"
+#include "base/task_runner.h"
+#include "mojo/edk/system/channel.h"
 #include "mojo/edk/system/system_impl_export.h"
 
-namespace base {
-class TaskRunner;
-}
-
 namespace mojo {
 namespace system {
 
-class Channel;
-
 struct MOJO_SYSTEM_IMPL_EXPORT ChannelInfo {
   ChannelInfo();
   ChannelInfo(scoped_refptr<Channel> channel,