Move move classes to the remoting::protocol namespace. Minor cleanups.

remoting/proto/internal.proto

Index: remoting/proto/internal.proto
diff --git a/remoting/proto/internal.proto b/remoting/proto/internal.proto
index 6949375beb17dbb321f4de4948370542c97d2d2d..7c4385b159950eda5dba1b75bc6fe636bba21d2c 100644
--- a/remoting/proto/internal.proto
+++ b/remoting/proto/internal.proto
@@ -9,11 +9,16 @@ syntax = "proto2";
 
 import "control.proto";
 import "event.proto";
-import "video.proto";
 
 option optimize_for = LITE_RUNTIME;
 
-package remoting;
+package remoting.protocol;
+
+// Represents a message being sent on the control channel.
+message ControlMessage {
+  optional SuggestResolutionRequest suggest_resolution = 1;
+  optional NotifyResolutionRequest notify_resolution = 2;
+}
 
 // TODO(garykac) This is dead, remove remaining references and delete.
 message ChromotingClientMessage {